Yea man, like someone said just don't hold back. Let her know it you don't like that fact. That doesn't mean to be possessive about it, but as long as she knows you don't like it, and she's STILL doing it, it's time to kick her to the curb because it simply means she doesn't respect ya enough........

Don't ever hold back your emotions and let girl trouble constantly creep under your skin. If you have an issue, talk to her about it right then. Don't let it bother you, it's a waste of time. I use to do it all the time, and it just made things worse because you let it build up.