I like you. You seem like a really nice person and your screen name warms a very special corner of my fatty fat heart. Because of this I want you to listen to me carefully. I will preface my words with the acknowledgement that sometimes the heart wants what it wants and that no one can tell you how to live your life.
This. Motherfucker. Ain't. Shit. Leave him immediately. He doesn't respect you, your body OR your feelings. His other girlfriend is a straight up certified bitch but if he is so easily swayed that a snatch can cause him to forsake all integrity and moral bearings then guess what? He STILL ain't shit AND he's weak to boot.
You can do better.