It COULD be mental illness, or many other things. I know some think it might be brain damage from concussions. But the fact that he’s acted this way long before he became a pro......it might also be that he’s just full of himself and is a self absorbed jerk.
I don’t know for sure of course, just throwing out there another possible reason for the way he acts.
It wouldn’t be the first time a famous person thought they were all that and a bag of chips.
I’m not trying to be mean. If it is mental illness, I hope he gets help.
If it’s what I posted as a possible reason for his actions, I hope he takes a good look at himself and straightens out.