Sure, if thats the case, I would show my full sympathy, patience and support on him.
But we can't just assume thats that case out of our pure speculation, can we?
The only known fact here is, he has been out for 3 months for no "official" reason, other than he needs to take his time off to find back his form. This is also likely due to him having been playing poorly this season, followed by having largely shite form last season.
He is one of our most expensive signings to date, and highest paid player in the squad too. Let's just not conveniently shield him from any blame/criticism just based on our pure speculation alone on whats going on behind the scene. Besides, the criticism we have on him is far less severe than that we have on players like Lingard, Pogba, Maguire, Rashford or even Ronaldo over the past 1-2 years or so. As long as he didn't really suffer from any mental condition which needs medication/care, I think he should really try to man up abit and sort it out quickly. Afterall, he was on huge wage and I think he owes the club something.