Recently I tried explaining to a non-comic why comedy is such an irrational, unsatisfying pursuit. Making it to a respectable level in comedy is about as probable as winning the lottery. Now, think of the kind of people you see playing the lottery regularly; babbling, unclean, unhinged freaks you would never want to spend time with. Now give that guy a scuffed up psyche and a need to "get back" at some girl or high school clique that rejected him and you have a portrait of most comics.
Would you want to spend time in a cramped green room with such duds? Worse yet, would you want to watch duds like that pass you in the business? The madness of it ends up tipping the few sane comics toward insanity.
Society mocks lotto regulars (the odds usually crush you), society condemns gamblers (the odds usually crush you), but society applauds people who pursue a dream in the arts, where the odds usually crush you. Something is wrong with this picture.
You're going to ask why I keep doing it, so I'll answer: because breaking up with comedy is hard to do.