1. Showing Up Late/Not calling
If you made the date, why are you showing up late? You picked the time, the place, you should be on time for your own date. Now obviously stuff happens, traffic, you needed gas, whatever, but that's why we have cell phones. Have respect for your date whether you made the date or you are going on one, because it's a major turn off when you start late and on the wrong foot.
2. Burying your head in your phone
A cell phone is a wonderful thing, but not when it's time to have real life human interaction. If you can't pry your eyes away from your phone for an hour to sit and chat and get to know someone, you have a real problem. Checking your phone obsessively, answering calls while on a date, excusing yourself to go talk to someone else, doesn't tend to bode well.
3. Demanding someone pay for you
"You're definitely going to pay right?" "You know, you should pay for our dinner." "Guys always pay for me." "Waiter, don't even think of handing me the bill" This one is more directed towards women...most guys tend to pay for a first date because either they are the gentlemanly type or they assume it's expected, or they invited you out, or they simply want to. Don't take advantage of this generosity by being rude and disrespectful about it. It's a MAJOR turn off to guys when you think you're some princess on a pedestal who demands they take care of you or else. Say thank you, be kind, offer to pay for the next one. Don't be spoiled and rude about it.
4. Checking out/flirting with other people
Like really? You can't go on one date before checking out the other merchandise. Imagine if your date did that to you. I'm pretty sure you wouldn't feel good about it. And actively flirting with someone else in front of your date is not cool at all. It's the fastest way to make sure they end the date early.
5. Endlessly Talking About Yourself
I'm pretty sure you're an interesting person, but 3 hours straight of interesting...not so much. Let your date get a word in edgewise. Actually ask him/her about him/her. Take a break and let them talk about themselves and practice listening. When it's all about you, it shows where your real priorities are, and they aren't with your date at all.
6. Obsessively talking about your ex...or anyone else
Hate your boss, your ex, your ex's kids, the president, the Uber driver...shut up about it. When you hyper focus on one person and go on long endless rants about him or her, it becomes less endearing and even scary by the minute. Like, why can't you let it go or why haven't you, or save it up for some other time other than on the first few dates when it should be about getting to know the other person.
7. Being totally inappropriate
Treating waitstaff rudely, assuming someone "should" go to bed with you just because you showed up, making disgusting jokes or comments about your date or someone else or his/her friends, insulting your date. Avoid this. If this inappropriate person is "the real you," then find someone who gets you and your brand; it will save you so much more time.
8. Give off the sad/bad vibes
No one needs to know how absolutely pathetic and miserable you've felt for not going on a date or sleeping with anyone in the last nine months. No one needs to know how much you hate your body and how incredibly low your self-confidence is. No one needs to know how desperately you want to get married and have children. It's a lot on the first few dates, it really is. Hammering in to your date how sad and pathetic or desperate or hung up you feel doesn't really say, I want to be attracted to you and your good vibes. Whatever has happened before this person, they didn't do it, so don't project onto them or overshare your misery with them. Just live in the moment and try to enjoy the date.
Remember when you said you had been to London and you really loved it. Now your date is talking about it and asking you about your trip and you have no clue because you're a liar. If you have to make up lies you can't even keep track of about yourself, ask yourself why that is. These can come back to bite you and make your date believe that you are a total liar or completely untrustworthy. Not a good look. If you're honest, you don't have to lie or remember what you lied about or try to keep up with it all.
10. Showing up as someone else
I don't care what you say about vanity and people needing to get to know someone on the inside, if you catfish someone or you post some picture of you from 15 years ago and you look nothing like that now, DO NOT act like you are surprised if they then aren't into you. In this world where we live where things are done more so online, if someone has been looking at that sexy picture you posted for a few weeks, they want to see that on their date or at least something that aligns with the picture they saw of you. It's part of why they are there or all of why they are there. Don't misunderstand this...you are lying to yourself and them by portraying yourself as something you are not. This goes back to the lying bit and why you shouldn't do it.