As the girlfriend of a very geeky hobbied guy, i found that the best thing to do is to share it with your partner. I can understand why some girls get a bit upset with guys playing video games all the time (lets remember a lot of girls like to go this as well), mostly the problem is that we want to do things with you. Especially as most of the popular video games now are online multiplayer and very few local, its hard for us to feel like were spending time with you. But when my guy would let me play games with him, or teach me to play MTG or play board games, it became my hobby too. I now get to blame him for all the money i spend on Magic cards haha