I don't think it's Wade or other guys who screwed with his head, it's Lue and the construction of the team. They messed up both JR and Shump by having them guard PGs and asking them to create on offense. If they had and played two PGs from camp onward I don't think JR would be passing up 3s to try to slash or create for others.
Same thing goes for Shump, if they had a viable PG last season, he would have never been asked to play backup PG. Him and JR developed bad habits by the lack of PGs on this team especially ones that can defend. I just don't know if they are fixable at this point. They were both 3 and D players that were asked to do more, now their 3 and D have gone down hill.