Mrs W -
Glad to hear your husband has made it through the treatments and sorry to hear about his mental / emotional state now.
Recovery from the physical is easily tracked. Scars soften, swelling goes away, etc The mental aspect of recovery for the patient and the primary caregiver is much harder to asses.
Life has thrown a lot at you and your husband over the last year or so. While getting back to his old ways may be a goal, you and your husband may have to recognize and accept a new "normal" With acceptance and patience, over time, his emotional and mental states may improve.
Good Luck