I don’t believe gaming was the issue, she was taking it out on the game but other issues in the marriage is the cause of her treatment towards you. My hubby works and plays video games, I don’t see anything wrong with it so as long as you aren’t abandoning your responsibilities.
I feel Arma kinda implied, inadvertently, what it was really about for his ex-wife? She seemingly wanted him to spend that time with her, hence the guilt-tripping around going to bed early so he'd come join her. Seems like she wanted him to come home from work, do his chores or what have you then unwind with her like talking, chilling and maybe lovemaking and was unhappy that he wanted to game over doing that. Feel free to correct me if I'm wrong, Arma.