LOL. Anytime my gf has ever been turned off by something I liked I sat her ass down and got her to check it out before I allowed her to bash my interests any further.Since then she can't put comics down, has learned all Anime is not about 15 year old girls with insane body proportions, Loves to play skylanders, And loves foreign films. I couldn't watch old episodes of Nip/Tuck because she thought it was just about sex now she loves it after actually sitting her ass down to watch it.
Do her a favor and open her closed mindedness to new things. If she refuses to at least try to understand your interests then let that ass go!
If she can't accept what you like, she obviously has no respect for you.
Yup find a new women, if a chick threatens to leave you because you enjoy something she views as socially unacceptable to her then she can, for lack of a better phrase, go eat someone elses d***.
Your not a dog and she seems to think she can train you via threats of leaving.
I used to a have a friend who dated a chick and she said if he left him she would kill herself. After wasting years of his life with this worthless cow he finally left and guess what? She didn't kill herself. So go find a women who doesn't try to control what you do. It's 2013 it shouldn't be hard to find a girl who shares the hobby of video games.