What this excruciating final scene drives home is that Jimmy really does not understand the consequences of being in a relationship. He has dealt with his Chuck problem as if he is a free agent. But the way he reads that final letter — ice cold, brittle, flippant — shows that he’s turned his heart into stone. And he never even thinks that Kim, who cares for him, wants to be there for him, even tried to protect him from Chuck’s passive-aggressive last twist of the knife, might be hurt by his utter rejection of human feeling. He’s decided to go it alone when it comes to dealing with the past and moving forward. He doesn’t see that this shuts Kim out and makes her feel like a fool for caring, for trying.
That’s a pretty big stretch. Why would he all of a sudden become cold to the girl he’s been friends with forever and now dating? She’s way above his league.
Obviously a switch flipped with Jimmy but I’m hoping for something a bit more drastic. Chuck dying was rough but is it enough to send him over the edge? Or was Chuck (twisted as he was) his morale compass?