Cuzz'ins Dating Ex-Boyfriends???

OMFG!! I don’t know how to feel about this at all…this is gonna sound so weird. My lil Cuzz’in datts 15 is dating my ex-boyfriend Junior. I Really don’t know how to feel about it. Is it nasty for your cuzz’in to date your ex-boyfriend??? Like…It really doesn’t bother me 1 bit, because he’s a A$$ hole who broke my heart. Like…I didn’t even know they was together before. They was only together 4 1 day. The reason why they broke up because he wanted to have sex with her on the 1st day. But…We had been together only for 1 month. I broke up with his A$$…because he lied to me and cheated on me with someother bi+ch he was with for a year. Like…OMFG!!…dis iz crazy. But..I don’t care about him and I don’t love him anymore, because I’m already with someone who can treat me better. Junior broke my heart. And..I’m scared for my little cousin. Imagine what he can do o her. I Need Some Advice. But…The Problem Is she’s REAL…Fresh in the pants. She only wants to have sex with him and they just got back together. I was on the phone with her last weekend and…She was telling me they was having sex at her grandmother’s house while noone but them in the house. OMFG!! should I Feel guilty??? I wanna look out for her, because I don’t want her to get hurt too, by my ex-boyfriend. I don’t know…Like…She doesn’t wanna listen to me and noone else. But…I’m not upset . Like…I Really regret dating this bastard. And He got the nerve to call me the other night saying he still in love with me and he said he still misses me. He F*cked up for That!! But…hey…he’s with my cuzz’in it’s a matter of time he’s gonna do the same to her. Like…I told her 2 be careful. And My little brothers are right. They told her the same thing. If a real boy loves you, he will wait for u, don’t be no A$$ 4 a boy. I REALLY NEED SOME ADVICE.:)