I'm so sorry for your son as I can only imagine what it must feel like for him. Your situation is a bit of a funny one as for so long you wanted H to come back and now you aren't too sure. All I can say is follow your gut feeling. You know better than us what your relationship was before, do you see a future? Could you see a change in mariage dynamic if H was to get some counselling ( I remember you indicating possible EA) to really get at the bottom of why he has behaved like that.
If you aren't in a rush, let the answers come to you.
Thinking of you (((((((hugs))))))))