I think for the most part -- other than the game turning into crap -- it was the feeling of degradation, and I think this comes with age. And it helped that during my breaks from the game I actually got to live life, and have meaningful experiences that further fueled my decision.*

*: I don't like the word decision here as it implies forms of hatred/anger, which I don't believe is the case in my situation. Since it happened naturally, I don't have feelings of guilt or regret.