Dude, if she is bitching and leaving just because you are entertaining yourself with video games, let her leave. But I'll tell you the same thing I tell my sons. All women are psycho. The trick is finding the right amount of psycho in a woman. Some will be too psycho and be too much to handle. Some will be more on the sane side and will become boring. But you'll find one that makes you laugh and love life while keeping you on your toes with silly psycho moments. You'll be comfortable but never bored. If this girl is like that, then keep her. But you are 18. You got your whole life to find the one.