Uh... Stop talking to her?
Talking to another girl? There shouldn't be any problem with just talking, so there is no need to do anything there. Try talking to your Boyfriend and see what he says about this girl.
demi cant stop the world and make things change is what that means and she cant make a girl stop falling in love with her boyfriend or spend more time with her boyfriend.
Instead of trying to get her to stop talking to him, you should get him to stop talking to you. He is alot more likely to give you what you want than she is.
If a girl keep on talking about her ex-boyfriend to you that means she still loves him!
a new single of his talking about if a girl was his boyfriend
It's not a bad thing. Honestly most girls get jealous when there boyfriend is talking to another girl. But you shouldn't worry about it.
beat him up.
the girl lost intrest
tell her "that was the past, its done, its over with. I'm your boyfriend now so just stop talking about him." that's what you should tell her
If I was the girlfriend, and I know what's going on, I will talk to this girl and ask her what she is trying to do. I will ask her if she knows that the boy she is trying to flirt has a girlfriend. I will be civilize and calm and be professional about talking to the other girl. I will also tell her how will she feel if it was her boyfriend that's being flirt by another girl. Then I will ask nicely to stop flirting with my boyfriend.
Confront to him that you don't like that. If he stop that means he values you, if he doesn't stop then you guys need to sit down and have a long talk.