I guess how important is poker to you? If it means a lot and you are under 25, I'd say concentrate on poker. 3 reasons: First you probably won't be with that girl in 10 years time anyway. I'm not saying dump her, but just don't care so much about her whining. Second, when you're younger you can learn things faster and easier (when you get older this won't come so easy), so work on your game. Additionally, at the table your mental acuity for making decisions, remember betting patterns,
tells and having the mental endurance for long sessions usually won't be as good when you get older. Third, when you get older, you may have more financial obligations or too many other responsibilities which won't afford you as much time or opportunity to play. So soak up your poker prime time while you can.
If you are say 26 to 30 you could go either way I suppose. If you're 31+ then personally I'd acquiesce a bit to her if you really love her and think there's a future between you two. This maybe sacrilege to say on this site but poker is just a game, unless of course that's how you earn your living.