"The question was, is my husband ever going to be able to do enough to make up for his infidelity. The answer is no."
Wow, psychic, huh?
Sounds like the easy way out...
Whatever happened to Retrouvaille? What is the risk? You are so skittish about it, I think the real threat to you is exploring your own intimacy issues and doing some tough growth around those issues.
Methinks you are more like your mom if you hold onto bitterness and not grow past the infidelity than if you let go of the bitterness and allow for the possibility of genuine intimacy -- whether or not your M ultimately succeeds or not.