Even if he wasn't talking about his dog, you never, ever choose the girl over the game. Because it isn't about the game. Two months from now, Destiny could very well be a thing in his past. However, whatever game he picks up afterwards is the new problem. Then, say he quits gaming, and picks up biking as a hobby. Then biking is the problem. Any hobby that is not focused completely on her is a problem. Any smart man will see the issue there. That relationship is not worth it.