BF,
You're right, Walking away from debts sure doesn't seem to bother XH.

But that's what worries me about his latest escapade. He just can't see anything wrong with what he does. He may well decide that OW is not 'the one' for him eventually, despite all the money she's given him. If he does, though, that constitutes a problem - for me, because he is not fixed (in that he can't see how wrong it is to treat people like this).

If he doesn't - because he finally wakes up to what is right and proper behaviour, he will be obligated to stay with her because of what she's done for him. And that constitutes a problem for me too.

The only solution appears to be WH's 'leave it to a higher power'. All too complicated for my poor brain.