Sorry to hear your wives never expressed remorse. That is pretty cold. If nothing else you would think they feel guilty for hurting you.
I still struggle with how my WW told me she can't live without me, that she wishes the affair never happened and she loves me with all her heart during a tearful conversation on Jan 1 and then a month later has decided she wants OM. Can a person really flip like that in a month when nothing happened during that interval to make her not love me? My wife never expressed any doubts about our marriage until late January.