The people chiding him about the video game are being dumbasses and missing the point. Nobody cares about your opinion on video games. Stop confusing the back-story with the main issue.
At any rate, I know it sucks, but it's probably for the best if he is shunning you. He clearly is not well and is never going to be well until he admits to himself that he's not well and actively seeks to do something about it. All you will know is repeated pain if you continue coming back to him without his acknowledgment that he's being completely inappropriate.