These are all really good so here's some others:

-When he/she has a problem you need to be there for them 100%, but when you have a problem, that's your problem and he/she can't even be bothered to listen.

-When he/she needs something you'd better snap to it, but if you need something you better be ready to go without.

-Always questioning you about where you've been and what you've been doing, or even getting mad if you don't tell them right away what they want to know. But they don't tell you a thing.

-Bad mouthing their ex. If they use words like "psycho" or "crazy" or "stalker" yet you never see any evidance of this person in their life (no crazy phone calls, texts, not showing up randomly,) it's a good sign that you might be labeled as "psycho" as well.