Help! Problems with my ex....?

I broke up with my gf a couple of days ago, i told her tht i was starting to feel more like friends than lovers & that i really wanted to stay friends with her. The next day she texted me asking how i could say that i dont want to hurt her, then turn around and break up with her. I told her that she and i both know that what i did was 4 the best. She has A LOT of other stuff going on with her and keeps texting me, which i DONT mind @ all, but it seems like she's trying to make me feel bad. She goes on & on about how much she cries & cnt sleep or eat etc. Then she got all pissed & strtd freakin out b/c she "feels that im avoiding her". THEN she turns right around, and starts being all sweet and calling me the pet name that she gave me. i RLY do wna have her as a friend, but this is pissing me off. What should i do? Thanks =)