Is it okay to be a little peeved in this situation?

My boyfriend's ex girlfriend hates me. I mean HATES me. They dated for three years and although he broke up with her, she is still madly in love with him. Calls and texts him all the time. He stopped talking to her for a while because of some crazy things she did towards me. However, lately he's been trying to, for lack of better words, salvage their friendship. I'm sort of okay with that seeing how they did know each other for a long time. He has told her that he is madly in love with me at which point she cried. I'm okay with them occasionally hanging out. But it seems, since trying to "salvage the friendship", he doesn't ignore her texts as often, they occasionally hang out, and leave each other comments on facebook. Oh, and she STILL hates me. Should I worry that their "friendship" might develop into something more? Has he crossed any boundaries? I do somewhat trust him but I am worried of what she could do. Should I bring it up with him or are my fears just delusional?

Thank you so much!
Is it okay to be a little peeved in this situation?
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