Recently my girlfriend of 2 months left me for my friend. We weren't super close friends but I had known him for a while and see eachother quite often. I really liked this girl and thought it was going well so was surprised when she broke up with me. I found out a couple days after we broke up that this friend made a move on her and they slept together the day before she broke up with me. I also found out from a mutual friend that the reason she was interested in him was because he's black, and no other black guy had ever shown interest in her so she wanted to try it out. I was pissed at this guy for making a move on her when he knew she was with me so I talked to him about it (over text). He blamed being drunk but said it was her choice to choose him over me. I told him out of anger that the only reason she was with him was because he's black. He called me racist for this and we haven't talked since. All of our mutual friends are now angry at me calling me racist for what I said, even the friend who told me that it's because hes black in the first place.

AITA for wanting to not be friends with this guy anymore?