well, I'm not sure but here are some ideas. hope you remember that you asked this question and go back to it. anyway, here are some ideas by Jlord.awesome:
talk to him more
talk to him about it,then u do something he really likes.
Talk to him the way you would talk to a friend. After all, he is you boyFRIEND.
You should either go and talk to him or you can also talk to him about it
He might be more buisy than usual. If you are concerend about it then just talk to him. If he likes you still then he will tell you why.
cause he still got her number and they talk more then they need to talk....
Any respectable boyfriend will not talk too much about his girlfriend.
Make efforts to become better than her boyfriend, and she will talk about you to her ex-boyfriend.
no
talk to him
Boyfriend or Bestfriend.
Don't say anything to her. It would only make matters worse and if she knows she is getting to you, she will just be more determined. Pay attention to your boyfriend and ignore her. If you talk to anyone, talk to your boyfriend, but do it calmly and reasonably.