I'm in a bad situation and don't know what to do about it can someone help I'll tell you all the details just help pls

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I wanna help
Well I have a cuzin she likes my friend and I told her I would help her so I've talked to him and did some things for her and now I think I have a crush on him and I don't know what to do I can't break her heart but I don't want mine broke either