While I agree that unfaithful spouses must face the consequences of their actions, uhh....that one's a bit difficult to swallow.
You kept thinking it was what he needed to feel better, and this morning you couldn't look him in the eye....I think it's obvious you aren't feeling so good about what happened. Not feeling too good about H, and perhaps even yourself? I think if you're trying to repair the damage caused to your M, then yes, your H needs and deserves as much reassurance as possible. However, not if it's going to cost you your self-esteem. I think you ought to be willing to do a lot for him to help him heal, but not something that hurts you as this has.
Hang in there and take care.
Getting over a painful experience is much like crossing monkey bars. You have to let go at some point in order to move forward. ~ Joseph Campbell