Painttheroses, first off let me applaud you for being such a caring friend/girlfriend. Secondly, please keep in mind that depression is a treatable condition as is OCD so don't freak out there is hope with the right care! Lol
It appears that this situation is going to play itself out in a couple different scenarios....

1. Your BF becomes mindful of his disorder and willingly gets treatment for it.
2. These things have an inclination to get worse so if he doesn't get treatment willingly,
he will be forced to eventually once he spirals out of control.

I can't believe his mother who is an RN doesn't get more involved in her son's well-being...