How do I help my boyfriend get through this?

It’s been going on since he was 11, he is now 18. It is not often that it happens now, but he admitted to me that it is an addiction and he doesn’t know what to do to stop it from happening. I need to support him and help him with this the best I can, but I don’t know how to..

Edit: He doesn’t want to do therapy, it’s not something that’s “normal” to his family and nobody knows about this addiction so it would be hard for him to even have access to therapy

Edit #2: Due to the comments about therapy kind of being the only option, how do I go about telling him he needs therapy without offending him or angering him? I am in therapy for my own reasons, but I wonder if maybe I should invite him to a few sessions for a while to see how he feels about it?