nd helping occasionally around the house

The situation doesn't look good. You work full-time and he's been "helping" around the house? He should take over and do the majority of chores right now.

He really doesn't have any other hobbies to occupy his time.

I'd sit him down, and tell him exactly how you feel about the situation. I'd also look into homepages where you get support for people with addiction.

In general....the dynamic in this relationship doesn't sound very healthy, so you should definitely also read up on terms like "emotional load", "learnt helplessness" etc. Continue building your support network, connect with people with shared interest online.