i saw something that the producers said jon has been suicidal and depressed since his resurrection, which is supposed to explain both his incessant whining about being alive and his incredible dumbassedness.
it's a more or less believable concept, and i'm gratified that they're trying to explain those things, but i don't think they did enough to clue the viewer in on jon's supposed post-resurrection depression. he just seemed like a whiny Fake Sugar Dick (WARNING, NOT THE REAL SUGAR DICK!).