I agree with Cheshire, you are taking advantage of your former ex by staying in the apartment. She is still hoping that things will work out for the two of you. Deep down, you know this. She yells out while you're on the phone with another girl because it's killing her you're not trying to work things out with her. Be kind and move out.

Healingme4me: You asked "Why can't she accept being friends?" May I answer that? Because she loves him. Love doesn't disappear just because you try to put it aside; because you have had problems; because the other person doesn't return your love back. I know this feeling very well. It's heart-wrenching.