I've told her once before not to mention my MA to anyone else because there are "tough guys" who want to show you how "useless" it is. I think I was hasty to break up with her but this has happened once before for the same reasons. Last time it didn't get physical though. Also, when you spend a lot of time with your GF and a lot of time doing kung fu, you can't hide it for long. I don't think it was her intention to get me into a fight, but that's why I warned her not to talk about it. The second time is the last straw. If she wants a BF like that, she can feel free to persue one now.