Jid
Thanks for checking in and giving us an update.
Are you too hard on him? I don't think so. It sounds like you still need reassurance and that's ok. Ask for it as long as you need it. It also sounds like your husband is patient and willing to talk to you. That's a good sign I believe.
As for him reacting to the OW being with someone else. I remember finding out some things about the OM after our Dday. I have to admit at that time I was a little jealous that he moved on. But after a time it only served to remind me that he wasn't the person I thought him to be, nor a person that I'd want to be with. My guess is your husband wasn't jealous. But he now sees the OW for how she is, and he wonders how he could ever have been so blinded by her.
Sounds like both of you are moving forward. 
GT