Or maybe "therapy and mental healthcare" are simply not up to the task and it's not a matter of access?

Haha, wow, yeah I'm sure the reason for all this was that Jensen couldn't find a therapist. Aside from assuming he cheated for mental health reasons (not sure where you get that, maybe he just wanted some strange), the man could literally buy an entire therapy practice for his private use or just put one on $250k retainer to be available at all times. I would be surprised if they didn't have coaches / mental health professionals that attend to him all the time anyway.

Sometimes people cheat, especially when they have lots of offers, money, free time, travel, and time away from family. It feels good, and gives a sweet rush of dopamine, and is part of men's biological wiring and selected for over the eons.