How do you get over a guy? i'm pretty sure i'm the rebound girl and i need advice.?

i'm currently in this bittersweet relationship with a guy who is everything i've dreamed of, only problem is, he's in a relationship with another girl. even bigger problem, we all live in the same household. one day we started talking and he asked if i ever ';liked'; him, and i told him there was a point where i did, but it was a little ';crush'; you know? then as we continued to talk, i guess you can say i became the ';rebound'; girl, but at the same time, i ended up falling for him. now i'm placed in a position, where he tells me he wants to be with me, but then i can hear them having sex. and i know he, as her boyfriend = it's okay for them to do, but it just hurts me so much. i want to talk to him and tell him how i feel, but i don't know how to bring it up. please help.How do you get over a guy? i'm pretty sure i'm the rebound girl and i need advice.?
ok boo boo you need to drop him tell your Friend and go get you a new man your life sounds like an anime show i know that sounds corny but it does anyways when i found out i was one of three sideline chicks i stabbed my BF in his hand don't worry didn't damage him that bad anyways let him go it may be hard but don't fall into it he doesn't care about you if he's sleeping around be a REAL women and and tell him ';im NO ONES side line chick'; trust me things will never happen if he's creeping

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