Is it normal that i hate my best friend?

I've basically known him my entire life. The obvious reason is cos we're cousins. We've been close since childhood, but we've gotten really close this past few years since i literally live in his house (and not to mention roommates) since my prents r overseas. So we're like practically bro's, bt the thing is since he's in a relationship, things have been diff with us. I understand tht I shld give him time with his gf, i guess its normal to feel jealous i admit. But its more complicated than that. His gf is my bstfrn and i practically introduced them together when she had this party and they hooked up and theyve been in contact ever since that party. I was happy that he found someoneI was very supportive of their relationship till i found out my bstfrn was literally a BITCH! She was using me just to get to my cousin, and shes done a lot of hurtful things to my otha bstfrn (one of them is my cousins sister) , which are her bestfriends too. Shes very manipulative that all of us wasnt aware that she was just using me and my bstfrn, so that she cn get what she wants. I decided to tell my cousin to break things off with her. I explaind evrything to my cousin about wt shes done, and i thought he would listen to me bt he didn't he decided to stick with her. Things got out of hand when me and my cousin's sister feel like he dsn't spend tht much time with us anymore (his family) like he's taking us for granted, it's like he doesnt appreciate our bond and friendship with him. So we had this big argument on how his gf is this big bitch and told him to break off with her. He started blowing up, shouting things at us, and he kept saying/shouting to his 'own' sister "I dont care, i dont care about you" like 3 times and she started crying so bad. I started to blow up as well, i shouted at him "you dont say that to your fucking sister man, shes your sister!" and then he wanted to fight with me, and i just layed off, i just couldn't deal with it. So i just said, "Bro's before ho's my ass!" And he just walked away. i dnt understand why would he be with someone who hurt his own family and literally made them cry, family always comes first. N e ways, what i did was, i distanced myself frm him, like i literally ignore him even if we're in the same room. It hurts though cos i miss hanging out with him so much and im just stuck. Idk wt to do. Should i be the better person and talk to him? But d thing is i gave him a a chance to fix things out, before the big argument, i did tell him i was pissed at him, i was even crying on how he doesnt spend tht much time with me anymore and told him it's like he doesnt appreciate me. After that he was still the same. It's been like 2 almost 3 weeks since i havent talked to him. Im tired of being the better person here, it always has to be me. I dont need to give him an apology, he needs to give me one, so wt should i do? Should i just cut it off with him?