Shay - hopefully one of those medications is an antidepressant, they are NOT addictive, and he really sounds like he needs it.
It's true, it's very hard for them to live with us if all they are seeing is the pain they have caused.
You need to talk to him clearly about forging a happier new R, about what each of you need to work on to do that. You need to help him understand that he CAN regain those lost feelings, but he will need to heal from his depression and you two need to do things together that are fun and bonding.