All the regular reasons, I guess. He needed to let off some steam, he needed adventure, he needed to feel handsome again. He needed to feel that he knew something — that all this aging was worth it, because he knew things young people didn't know yet. He probably thought it would be like having a few tall drinks and feeling very, very good. And then he'd go back to his life and say, "That was nice." When it went away he was heartbroken. And then he realised everything he already had was not right either. And that was why it had happened in the first place. All because his life with his family was just a temporary bandage on a permanent wound.