Friend Struggle: somewhat of a rant

So I’m in love with this guy and I do actually mean in love. We’ve been friends for a long time and are really close but he has a girlfriend which I helped him get. He knows how I feel towards him.

I helped him get this girl because he cared about her but I personally have never thought kindly of her. When I’ve told him this he gets mad about it and doesn’t seem to respect how I feel.

I think they are a pretty good couple I just don’t think she’s a good person behind her outer shell. He’s falling for her now and that’s great and he talks about her a lot which is great but I don’t always want to.

I don’t know what to do because it seems to have come to a point of us not being able to be friends and get along. I also don’t want to be the cause of his first heart break.