My sister is dating my ex!

I dont know what to do me and my boyfriend split up and now my sister is going out with him I dont know what to do I even tried talking to her about it I can stop thinking about him and I cant even look at her any more...how can I make the pain go awy??

Are you kidding me your sister? Im sorry but what a bad sister. you need to talk to her and tell her how your feel that isnt cool for her to do to you! if she doesnt listen you cant really do anything about it but you can get over it.. go hang out with friends dont stay in the house all the time do things to get your mind off of it. IT will get easier every day I promise- good luck

omg... that's horrible. You need to talk to her and tell her.