My gay friends is in a abusive relationship?

Ok so I have two besties... And I love them both. One is a girl and one is a boy. Now I know this sounds weird but its my male bestie thats in the abusive relationship. His name is gregory and yes hes gay. Ok... Now Gregory is quite feminine, hes the most sweetest, modest, would do anything for anyone guy. Hes always had a hard time fitting in bcus he kinda scrawny, feminine and of course gay. So basically when he meets someone who accepts him for him he will cling to them. Sooo greg has met a guy.. Very big and manly (wouldnt even think hes gay).. His name is darnell.. Anyway they been dating since last july. Me and my other bestie ( brea), has been noticing how jealous darnell is over greg and also his temper. He'll call greg up yelln ang cursing at him just bcus his day was bad, and hes always accusing him of being with othet guys.. (darnell doesnt like me or brea, he hates women. Why? Idk) .. Darnell gets mad when greg hangs with us.. Hes just a men guy Ok a couple of weeks ago I visted greg at work, I havent heard from him. I noticed his lips was busted.. It looked liked it was in the process of healn cus it had a scab. I asked what happened and greg wouldnt tell me. Its kinda like he wanted to tell me but was scared.. He pretended like he was sooo busy so I just left.. And lastnight I saw greg and he was walking with a limp... Me and brea both asked wat happened but... He ignored us What should me and brea do?... Greg is totally avoiding us.. And we are sad and we want him to break up with that a**hole