Just to chime in & im sure you might’ve read about people with addictions....you’re in a relationship with 3 things. Him, you & his addiction. You won’t come first. Is that ok with you? I do know some people can live like that & manage it. But can you?
You’ve been honest with him & maybe, subconsciously, you’ve been very honest with him in the hope that this would spark movement with him in this relationship whether positive or negative. And he’s given you his answer. Basically his blessing.

See how things progress with the other person. I hope well.