It's insane that fangirls were angry at him. If he's got a reason to leave then they should respect that and support him. Getting angry at him wouldn't make him reconsider, in fact that would make him want to leave even more so. It would be perfectly fine to be angry if he had done drugs or something worse.
It's not like he's dying, I really don't know why everybody is so sad, he's obviously done this for the best. He's probably a lot happier now that he has left, besides, he still keeps in contact with everybody from Ancafe so he certainly won't be lonely. So why can't we just be happy for him?
I'm sure in a few years, once he has sorted out what was bothering him, he will probably rejoin Ancafe or emerge in another band.
Sorry for the speech...it just annoys me that people are reacting so strongly towards someting that really isn't that bad if you think about it.