All I can tell you is what the divorcebusting text says.. on pp 231 it says outright that until the addiction or obsession becomes inconvenient for him and he suffers some losses it will continue.

The text is pretty clear on that. Unchecked affairs can run for years...

The downside of a roller-coaster does not at all mean the ride is over...

It may be ending, but it will be ending because the affair is an inconvenience... not because its boring.. What signs is there that the infidelity is now an inconvenience?

What obstacles is he facing that keep him from pursuing the infidelity further?