"Your therapist told you only about your physical healing.  That's the easy part.  Healing up there (emotional) is much harder to do." Rosie

The quote is saying that  he is healing so he can do active things but in his heart it is a lot harder to do and heal in the heart then it is to heal on the outside. Healing and changing is hard in different ways for everyone. Healing physically is easier then healing mentally. Also some people just can't change and some people can very easily.