Hopefully he comes to his senses and reconciles with his wife. 
There's been an awful lot of water under that bridge, to say the least. But stranger things have happened. God can do
anything.
I cannot fathom how Mel lives in mortal sin --- if indeed he is "shacked up" with this present woman, and lives a conventional conjugal life with her --- knowing what he knows, and believing what he believes. Supporting the children he has fathered, absolutely. Being a part of their lives, absolutely. Being decent towards the mothers of his children, absolutely. Having sex with the present love interest, absolutely
not. He knows better.