Hmm...let's see here. I've had a few bad ex's, one in particular who cheated on me with my superior officer in JROTC (Story has a happy ending...I ended up outranking them both when I took over the battalion as commander...I'll let you guess how that ended up ), so I'll post. Her is only used because that's my experience.

1) Moves too fast (no, we aren't all interested in hopping in bed first date)
2) Acts suspiciously regarding family and parents
3) Only wanting you around when family/friends aren't
4) Dogged pursuit before dating
5) She firmly believes you're only doing formalities when you give a compliment
6) Speaks very fondly of ex's (my old boss, in this case)
7) Uses emotions as a tool
8) Refusal to talk about problems
9) Omits details when telling stories, or purposely skips parts