well, as we found out recently he comes from a shitty family (his mom and sister asking him for money and pressing charges against him).
he seems like he loves acting and what it takes (losing / gaining weight, studying characters, etc.), but just wants to ride out his 12 hours a day on the set and go home.
he doesn't want every asshole asking him how he gets his abs or what his favorite make of underwear is. he just wants to be left alone, go home, smoke a pack of cigarettes, get a handjob from his wife and go to sleep.
he's basically the opposite of that cheesedick matthew mccougnahey or however you spell it.