My Bestfriend Turns into a Stupid Gangster

My bestfriend is very kind.
He is caring, loving, gentleman and a perfect guy for any girl. He is the one that everybody wants------

even me.

But He fell in love with a girl that is very different from his attitude. Very different. He is kind. She is bitch.

I warned him but he didn't believe me, she love that girl very much. He said, he wants to make that girl to change but he is wrong. He is the one who's change. A kind one to a stupid gangster.