Hold onto the good feelings you are having now, they will help you get through when the roller coaster goes down. This bit of bliss that you're feeling, I felt it too, for about 5 months or so after DDay. I thought H and I would be the couple that healed within a year because my H was the model FWS as well. Then the shock wore off, the anger set in, and I realized the "truth" I thought I had from the beginning was in fact not the truth in it's entirety. So be prepared for TT, it happens in just about every situation.
And if you sit and think about it for 2 seconds, they say it takes 2 to 5 years to fully heal from infidelity. You are just a month out, so why WOULDN'T you still be hurt and feeling things and thinking things and wanting to talk about it? When they say it's going to take a long time, they MEAN it's going to take a long time. My H had ONS's with random people, his first one was a customer that he only spent 4 hours in her house and she was able to get into his pants. She wasn't nearly as hideous as he tried to describe her the first few times... he did that to not hurt my feelings. Also very common.
You're going to have ups and downs, it's great that he seems to be doing the work, but this is a marathon, not a sprint. So while it's wonderful he's doing the work now, it's how he goes on in the long run that will determine how much he wants to fix things. I hope for you, for your family, that he's a good long distance runner.