Hey! You are making a big assumption that the OW "got it good". LOL I very much doubt that she got it all that good when all the while your H was having a severe case of the guilts!
And....aren't you the same woman who just had an evening in front of the fireplace?! Hmmmmm Sounds romantic to me. (Well, ANYTHING sounds romantic to me at this point! LOL)
Maybe it's time to experiment and monitor again. (All the while being thankful for what you have! )
Maybe your H is in the mood to be pursued? Maybe he needs you to set the tone? Come up with an idea about maybe taking alternate weekends to come up with romantic outings? If he doesn't respond right away (or badly) give him time. He's just getting into his comfort zone right now.