I hang around guys a lot, one thing I've noticed that turns off a lot of guys 99% of the time is when you start talking about the future too soon ie. saying you can't wait until we get married, or talking about kids, or talking about living together, etc especially when he's not ready.
Other than that, I believe it depends on the guy and the relationship. I've seen needy, insecure girls who have been in relationships with the same guy for years, and the guy still puts up with her. They be fighting a lot lol... but the love is still there.