I hate my best friends boyfriend

I have been struggling with this for a long time now, sometimes I have a hard time sleeping because of how angry it gets me.

For context, my best friend I’ve known since middle school, currently in sophomore year in college met this guy through a friend of my brothers about two years ago. Back then I had a bigger friend group and the all started dating while I was visiting my home country for the summer. After I came back everyone was coupled up and I was the only single one, which I didn’t care at first until I started feeling extremely isolated and ignored. It felt like their boyfriends mattered more to them to spending time with me. Of course they also made me feel self conscious on why I wasn’t in a relationship but the truth is I did not want a relationship at all. Sorry for getting side tracked, anyways my best friends boyfriend was always rude, to me, to her, to our other friends. He always had something to say, he never apologized for his mistakes, and he also had very bad anger issues. On my birthday, after I told him to quit acting extremely obnoxious in my house because he was going to pop one of the air mattresses we were using (he has no respect for other peoples property) I saw no one else was willing to tell him anything since they are all scared of him (he’s a big guy with anger issues). Well the only way I could think of in the moment to get his attention to listen to me was to physically slap his back. So I did, it was light and it didn’t hurt him but it finally got him to stop doing what he was doing. Then he provided to get up, take the mattresses and slap me into the wall with it, to with I hit my head and a painting that was hanging fell next to me. After this, instead of coming to comfort me, my friend went over to him to comfort him. I felt extremely angry in that moment, there was atleast 10 people in the room and no one dared to say anything to him, including me and I should have kicked him out. My head hurt for 3 days after, he never apologized. There has been many times that he has made me feel less than him or less than human, he has a big ego and he thinks he’s better than everyone. He also is racist, misogynistic and anything else you can think of, he always had somehting to say about someone. Last year, while me and my friend were wathcing TV she got a text from an unknown insta account which sent us screenshots of her boyfriends dms to another girl, telling her things he’d do to her. Basically he cheated, that night I told her to sleep over at my house and that eveyrbting will be ok but he made his way to my house, got in with the garage code which I didn’t give him, and went up banging on my bedroom door, to which I told him to leave and he’s not allowed here. He completely ignored me, not looking at me or talking to me and as soon as my friend saw him she melted back and started giggling. They went to talk, after a week of my convincing her to break up with him she finally did and I thought everyone was over. Not even a week later the were having out again, and later in the summer they got back together. Now they’ve been together for a few months and I have told her I have no desire to see him or hear him out, he’s had his chances. I blocked him on everything, and it makes me so angry that she decided to get back togtehr with him. Not only but he is jealous, he doesn’t like it when she hangs out with her friends, even though he hangs out with her more than anyone. He also is always blowing up her phone when she is hanging out. People that we mutually know also have begun to distance themselves from her because of her boyfriend, he is isolating her. And yesterday, she tried to talk to me to get me to tolerate him because it was making her sad that she couldn’t have us hang out all together like we used to. I was adamant I wanted nothing to do with him anymore and that I hate him and nothing will change but at the end there was no other way than to agree that I would try to tolerate him, which I will not. So now it’s bothering me a lot, that him coming in has done this to our friendship and that she can’t see that he is the problem here. I genuinely don’t know what to do anymore because I love my best friend.