Dating Due Diligence: 7 Red Flags You Should Never Ignore

I remember sitting across from "Sarah" at a high-end sushi spot in downtown Chicago. On paper, she was perfect. She ran her own marketing agency, laughed at my dry jokes, and had a smile that could disarm a traffic cop.

But about twenty minutes in, my stomach tightened. It wasn't the sashimi. It was a subtle comment she made about her best friend—a backhanded compliment that felt more like a dagger wrapped in velvet. I ignored it. I ignored the three other times she did it that night, too.

Fast forward three months, and that same sharp tongue was turned on me. The relationship ended in a blaze of drama that cost me weeks of productivity and peace of mind.

In my years of building businesses and navigating the modern dating scene, I’ve learned that dating is a lot like due diligence in a merger. You can’t just look at the glossy brochure; you have to look at the financials. You have to look for the red flags.

Most of us ignore red flags because we want the relationship to work. We’re lonely, or the chemistry is high, or we’re just tired of swiping. But spotting these warning signs early isn't about being cynical—it’s about protecting your time, your energy, and your emotional bank account.

Here is how to spot the red flags before you get too invested, based on hard-won experience.

The "Service Industry" Test

You’ve probably heard this one, but I’m putting it first because it has a 100% accuracy rate in my life. Watch how your date treats people who are "serving" them—waiters, bartenders, Uber drivers, or the host at the restaurant.

I once went out with a woman who was incredibly charming to me but snapped her fingers at the bartender to get his attention. Later, she sent a dish back because it was "lukewarm" (it was steaming), without making eye contact with the waiter.

Here is the lesson: Character isn't how you treat people you want to impress; it's how you treat people who can do absolutely nothing for you. If they are rude, dismissive, or condescending to service staff, they have a superiority complex. Eventually, the "new relationship" shine will wear off, and you will become the person they treat with contempt.

The "Crazy Ex" Narrative

We all have baggage. I have exes I didn't get along with. I have relationships that failed because of my own shortcomings. That’s normal.

What isn't normal is when every single one of their exes is described as "crazy," "psycho," or "toxic."

If you are on date one or two and they are already unloading a saga about how they were the victim in every past scenario, run. This suggests two things:

1. Lack of Accountability: They are unable to see their role in relationship dynamics. It takes two to tango, and if they are always the victim, they aren't learning from their mistakes.
2. Unresolved Drama: If they are talking about their ex with that much heat, they aren't over it. You are likely a rebound or a therapist, not a partner.

When someone tells you all their exes are crazy, realize that you are just auditioning to be the next "crazy ex" in their story.

Intensity and Love Bombing

As an entrepreneur, I’m used to sales pitches. I know when someone is trying to close a deal too fast. In dating, this is called "love bombing," and it is one of the most dangerous red flags because it feels great at first.

Real intimacy takes time to build. It’s a slow burn.

I remember meeting a girl who, by the second date, was telling me she had "never felt this way before" and that we were "soulmates." She was planning trips for us three months out. My ego loved it. I felt seen. I felt special.

But healthy people have boundaries and pace themselves. Someone who pushes for instant exclusivity, says "I love you" within weeks, or tries to monopolize all your time immediately is not falling in love with you. They are falling in love with the fantasy of you, or they are trying to lock you down before you see their flaws.

When the dopamine hit wears off and you start showing human imperfections, the love bomber often turns cold or controlling. If it feels too good to be true, it usually is.

The Inconsistency Trap

In business, consistency is key. If a vendor promises a delivery on Tuesday and shows up on Thursday with no explanation, I fire them. In dating, we let this slide way too often.

Pay attention to the alignment between their words and their actions.

• Do they say they want to see you, but never initiate plans?
• Do they promise to call at 8:00 PM but text at 10:30 PM with a lame excuse?
• Do they act hot and cold—blowing up your phone one day and disappearing the next?

Inconsistency creates anxiety. It keeps you on your toes, wondering where you stand. This is often a manipulation tactic (intermittent reinforcement), or simply a sign that you are a low priority.

I used to chase inconsistent women because I viewed it as a challenge. I wanted to "win" their attention. Now, at 33, I realize that clarity is kind. If they like you, you will know. If they are confused, it’s a red flag.

Testing Your Boundaries

This one is subtle, but it's crucial to catch early. A red flag isn't always a massive explosion; sometimes it's a small poke to see how much you'll tolerate.

Let's say you tell your date, "I have an early meeting tomorrow, so I need to be home by 10." A green flag response: "Totally get it. Let's get the check." A red flag response: "Oh come on, don't be boring. Just one more drink. You’re the boss, you can go in late."

It seems playful, but it's a boundary violation. They are prioritizing their desire for fun over your stated needs and professional commitments. If they don't respect your small "no" early on, they definitely won't respect your big "no" later when the stakes are higher.

Watch for the people who try to guilt-trip you or negotiate your boundaries. You are not a democracy; your boundaries are executive orders.

The Gossip and The Critic

Pay close attention to what they talk about. Are they talking about ideas, goals, hobbies, or events? Or are they strictly talking about other people?

I once dated a woman who spent the entirety of our third date criticizing her friends' life choices. She critiqued their weddings, their jobs, and their bodies. At the time, I thought we were just "people watching."

Eventually, I realized that if she was talking to me about them, she was talking to them about me.

Chronic negativity is draining. A partner should be your cheerleader, not a critic. If they are judgmental of everyone around them, it indicates deep insecurity. You don't want to build a life with someone who derives their self-worth from bringing others down.

Trust Your Gut (The Subconscious Data)

Finally, trust your intuition. As an entrepreneur, I rely on data, but I also rely on my gut. Your intuition is just your brain processing thousands of micro-data points that your conscious mind hasn't articulated yet.

If you leave a date feeling drained rather than energized, pay attention. If you find yourself constantly explaining their behavior to your friends ("He's just stressed at work," "She's just really passionate"), pay attention. If you feel like you have to walk on eggshells to avoid upsetting them, pay attention.

The body keeps the score. If you feel anxious, tight, or "off" around them, it doesn't matter how good they look on paper or how much fun you have in the good moments. Your gut is telling you that you are not safe.

The Takeaway

Dating is an elimination game. It sounds harsh, but it’s true. You are looking for the one person who fits your life, which means the vast majority of people you meet won't be a match.

Spotting red flags isn't about judging people as "bad." It's about recognizing incompatibility and toxicity before you merge your lives. It’s about having enough self-respect to say, "I see this behavior, and I know I deserve better."

Don't ignore the data. If you see a red flag early, don't try to paint it white. Acknowledge it, and be willing to walk away. The right person won't leave you wondering.