How can I care less about this?

[ɱichelle]

I've been with my boyfriend for almost a year. I'm 23, he's 24. His ex girlfriend is 18 and they were together for like a month. The thing is, his ex is always there, she even tries to do the same things he does, tries to love the same music, even got him a birthday present and is always putting <3 on his wall on facebook. She even tries to hold hands with him. He told me that she was always trying to hold his hand and I told him to make it stop so he said he told her. She adds me on facebook, instagram, twitter, with another accounts (i think those accounts are from her friends, even got profile pictures with her), and he says she's part of their group of friends and that he doesn't like her, she was dating other guy while they were dating. But she's still a child and is too deep into US... she knows who I am, my boyfriend told her that i was HIS GIRLFRIEND and she still doesn't care and tags him in her own pictures and stuff. He doesn't respond to anything of that, but he does goes out with her and their other friends. I can't stand it. I think it's the only thing we argue for. Am I being too jealous or what should i do? thank you.

[Gábor]

Your boyfriend obviously likes the attention he's getting now you could do it the mature way or the immature way you need to talk to him about how you feel or get one of your ex boyfriends back in your life, choose wisely