There's a place for talk about exes, one of the first things you want to know about someone is why they're single. It brings up red flags if it's ALL the ex's fault, and you are always the innocent victim in the ends of your relationships. It's also a big red flag if you go on & on about an ex. You're probably not over her yet.
I second everything gaea said about obsession with "hotness" - HUGE turn-off!
And if I ever decide to date Dee, I'm bringing a fishing pole