Viviana is deluded. He's having his cake and eating it, no skin of his nose, and its all OK thanks to the multiverse - lol at the BS excuse. Doesn't matter how many universes exist, he is in this one, another him could be in another, but there's only 1 of him being a twat in this universe and its the current experience that counts, no changing that.
Viviana is very gullible unfortunately and moulds her life to suit any man's lifestyle no doubt - probably feigned an interest in theoretical physics, how convenient. Probably won't see him again in this universe, just hasn't realised its probably over in the physical sense - never mind she can fall back on the hope that in another universe her other self has him all the time ( while he sees his bit on the side) lol.
Just comes down to him being a selfish creep really. Got it all with his wife, but still craves the ego stroke elsewhere. I hope his DW finds out and dumps him.