Am I bad friend for not talking to my friend about a guy?

So basically I was talking to this guy , who she knows I like and have real feelings for, so his friends are really annoying and say dumb things sometimes rude things to me and my friends , and he just sits there. So I got mad at him and we haven’t talked in a week. And now they are spending a lot of time together and I want to talk to her about him but I don’t want to ruin are friendship. What should I doo???