Im still questioning if his head injury has something to do with this.
Ummmm....yes.
The incidence of depression goes way up with head injuries. And when someone is depressed, they look around to see "why" they're unhappy - and who do they see? You!
They then become convinced that they COULD be happy if only they changed their circumstances. Like an animal in a trap, they'll chew off their own leg to get away from what they think is the source of their depression.
Of course, the temporary dopamine "high" they get from an affair or from the novelty of the change briefly makes them feel better - but their depression will settle back in sooner or later - because you really aren't the cause.
