Am I oversenstive?

Hello all!!! I have been in a relationship with my girlfriend for just coming up to a year. Everything runs pretty smoothly, however there is one thing that we have argued about and that is her male best friend. A few years ago in told her that he had feelings for her, which doesnt help. Also being a man, I also know what they are like. I dont have issue with their friendship and I dont have any trust issues concerning my girlfriend. My main issue is the way he acts around my girlfriend and what he says to her: Some of the things he has said or done: - I was with a girl last night and we had to stop having sex as I was too big for her. - About his fancy dress costume which consisted of hotpants 'Its going to be embarrasing as people will be able to see everything and will stare because it is so big.' I have seen him in hot pants and there is nothing to see - Overly touchy. - My favourite text he sent her 'you would be proud of me, a girl wanted to meet me for sex from tinder and I didnt' I do not know any man that would say these things to his male friends. I find the way that he speaks to her entirely inappropriate and he regularly crosses a line. She says that she knows that he is a dick, and doesnt think anything of it because that is the way that he is. Me and him are 2 very different people and even though roughly the same age we are at very different stages of our life. The last time that he said something I reacted physically and ended up shaking. But I dont know whether or not I am being overly sensitive. She has even admitted that some of the things that she says to him is inappropriate. I think that I am rambling. J