my boyfriend and his ex? kid involved, i know she just wants him.?

my b/f lived with this girl 12 years ago, they had a son and when they split up she took the baby out of state, he let go of them, she got married and her husband adopted this kid. about a year ago she comes around and says shes getting divorced and wants to tell the kid that my b/f is the real dad. month passed, she interveened in our relationship but never told the boy anything. my b/f met the boy as a friend maybe 2 times. she tried to get my b/f to sleep w/ her and would call after 2 am saying she need to talk to him, she would say she needed to see him and when he went to her it was all about her not the kid. my b/f and i broke up over this, then we got back together he said he would step away and kinda keep her at a distance so he always kept track of his kid. now he's trying to meet with her. he says its part of keeping her as some kind of aquaintance. iam not comfortable with that after the way she's acted should i be ok with it, i know he wants to keep his kid around?