She broke up with me and is seeing someone else but we live together and i want her back?

Tell her you love her every chance you get and try to get close to her. If she tries to have sex with you and you feel she is just trying to fufill her needs, tell her nicely even though its hard. Yelling gets you nowhere. Try to meet up with the guy and see if he really loves her. If he seems uneasy about their relationship, tell him that your still in love with her. If you try these things, she should come around but if she doesnt, Im sorry to say it, but it wasnt meant to be. Hope I helped.