He could also try Internal Family Systems (IFS). It's way better than cognitive behavioral therapy, IMHO, because it's about understanding the parts of the psyche. This includes the helpful, not so helpful, and parts that make us do negative behaviors and coming to terms with them instead of suppressing them.
I feel like my IFS trained therapist is actually a professional doing skilled work helping me explore and understand my personality instead of just being a rent-a-friend like my previous therapists.
I'm starting to have success with IFS. It's a bit weird at first. But I like how it actually listens to and tries to understand the various parts that make up your psyche, rather than just convincing them that they're wrong, like in CBT. I find CBT exercises helpful, but at some point we need more than just pointing out cognitive distortions.
I feel like my IFS trained therapist is actually a professional doing skilled work helping me explore and understand my personality instead of just being a rent-a-friend like my previous therapists.