Mine is not being able to have a deep/Intelligent conversation with a guy
Most Helpful Guy
These are the big ones.
Drug use (caffeine excluded, of course)
Being really bad with kids. Nasty with them.
I had a girlfriend who kept claiming that she loved kids, and was amazing with them. Then I saw her scream at a friend's two year old who spilled a drink by accident - just turned me right off. I mean, the fact that the kid (at that age especially) was working with a regular heavy glass mug and doing good at handling it (no sippy cup), minus the little spill (understandable), I was a bit proud of him, and especially at a time where it was past his bedtime, and he was behaving awesomely... just... I was embarrassed to be around her. And I apologized to the kid and his mom (when she was away), and tried to make him understand that he was doing really well and acting like a big kid, and I was proud of him.
Being selfish more often than not.
Being a pathological liar. Cheating. All of these have to do with trust.
Stubbornness with lying. If you can't give up eating something that I'm seriously allergic to... As silly as it might sound, if you're that addicted to, say, your peanut butter candies, then don't date a guy who is deathly allergic to it, especially when you have seen some of what it does to him.
I like chocolate OK, but if my future hypothetical wife had a deathly airborne allergy to it, well, It'd be gone. Out of the house. (Now, I might get some when she is on vacation away from me for a week, but other than that, it's gone). I'm not that dependent on anything to hurt my future wife if it makes her that sick.
Someone who's slept around a lot. 1) I don't want to run the risk of STD's. 2) Just psychologically, I don't want to be compared in that way.