What if a girl continues to flirt with your boyfriend?

Ok, My boyfriend, Shannon, and I have been going out for about two months now. Well, this other girl, Sam, really really likes him, but the two of them went out for like a week, he broke up with her, because she's controlling, and he didnt grow any feelings for him. A while ago, for a stupid reason we broke up, during that time, she began flirting with him like crazy, and he kept coming up to me and telling me how it's really start to bug him cause he doesn't like her in that way. but she seems to not get that( we still talked when we broke up). A couple of days after that, we got back together, she continues to flirt with him, RIGHT IN FRONT OF ME, and yet she still comes up to me and says,' i just want you to know, theres nothing going on between me and Shannon' but today for Valentine's day at our school, they gave out carnations, Shannon, gave me 12 red roses, i saw him after school and his head was in his locker, so i went up to thank him and all, and he pulled out a red rose and said he got it from Sam. That B*%#H. He's really P.O'd about it and wants to go and talk to her about it. but what if she sent it to him just as a friend, i tell myself, but see if she meant it as a friend then why didn't she send him a white or yellow one.


WHY DID SHE GIVE HIM A RED ONE???????


What should Me and Shannon do about this??


It's starting to annoy both of us.


And we already tried talking to herWhat if a girl continues to flirt with your boyfriend?
Tell her she'd better step the fork off otherwise you'll put your foot far up her butt she'll feel it till she's 50.What if a girl continues to flirt with your boyfriend?
if you've already tried talking to her, whoop the **** out of her. if she blatantly disrespects you by flirting with your boyfriend and constantly doing things of that sort, she doesn't deserve any more time to back off.
ignore her, don't hangout with her, she is clearly still interested in him and wants to be with him so the two of them can not be 'just friends' until she moves on.
i would go to her alone and tell her that if she does not stop firlting with our man that something bad is going to happen
Dont talk, just tell. Dont be nice about it.
Have him talk to her in no uncertain terms.