So is there anyone else that has had a situation like mine whose marriage has survived?
SOA, some people can get past infidelity--a lot of couples do, but like Dance said, BOTH parties have to want it. In this case, you H has told you he doesn't want to reconcile and wants to D. Though it pains you and breaks your heart, all you can do is accept his decision and move on. Do not repeat the same mistakes in the future.