I was fixing some cupboard doors in my gfs apartment and she thought it would be funny to come up behind me and kick me full force in the nads. I doubled over, threw up and now I swear my nuts are floating around somewhere in my stomach. She apologised after I got mad and said she didn't mean to do it hard and didn't think it would hurt bad but I'm pissed. Why do some people think this is ok? Clearly if I ever hurt her in any way it wouldn't be ok so why is it funny for her to hurt me? She advocates against violence against women so I find it a touch hypocritical. Who's going to advocate for my innocent testicle's right not to be kicked to high heaven?

Edit: Thanks for the advise I have a lot to think about. On the plus side, my ball has descend back into the scrotum now.