Hi and welcome.
Sorry I'm not much help. How long has he had crohns?
It is important for crohns sufferers to take responsibility for their health. It sounds like he maybe dealing with depression. Would he consider counseling?
We do have a section for caregivers, parents, partners of IBD sufferers. I'm sure others can relate to your situation. I can't past the link but check it out. Crohns takes a toll on everyone involved. Sending you my support.