I'm not there, of course, but I still say Talk is Cheap. IF he KNEW it was truly what he wanted with all his heart and soul, nothing, not family, money, retirement, or security would have kept him down for 15 months.
The same holds for my H. Straight from the L's mouth, "No one can hold up a divorce if the other truly wants it." Apparently there were concerns, both obvious and not obvious, that were more important than the OW. In the back of his mind, he knows this person dumped on him before, she's capable of it again.
Not saying this just to be 'on your side'. I truly believe it. I've just reached the point that any further concerns of my H do not concern me. Triple (((HUGS)))