Sometimes giving advice is how we support each other; even when the advice seems harsh. But, enough on that subject.
First: the info you get on his new R is secondhand and hearsay. It's not always true.
Second: What have you done to make changes since the two of you divorced? Have you made a set of goals to work on? (not just related to the affair, there must have been other reasons that both of you were unhappy.) Are you absolutely sure that if the two of you had a chance to be together, that the same problems wouldn't come up again? T