"what if he IS happier and what if he DOES live well and what if he NEVER regrets this..."???"
I would not want to bet on that, in fact I would take the bet and give you odds on the other side of the bet.
Switching partners without doing any work is a recipe for disaster.
If it was so easy then the second marriage divorce rates would not be higher than the first time marriage divorce rates.( and third time marriages(divorce rates) even higher than that.
