I'm not going to stop a game with my friends for my girlfriend
Why would you not stop playing with your friends for your girlfriend?
I'm not interested in her enough to stop gaming.
You have a right to spend free time as you please but you have a girlfriend to consider as well. Don't be so addicted to those games, they will eventually take over your life.
I don't know, maybe I should just dump her.
That seems like an overreaction, wouldn't it be better to talk to your girlfriend and try to find a compromise? If you value gaming and your girlfriend, you'll try to find a solution that works for both of you.