That's fair... I know its hard to know what to say in the heat of the moment... I've been there...
yes, I would take it as a good sign, but I really would try more to just let GO... if you fixate on signs he's reconsidering he's drawing you into his drama...
And yes, 99% of affairs end on their own... it may take 6 months or a year, but they do fall apart ... two immature people who ruin two families do not have the maturity to respect each other long term... ONE of them will become wayward on the other...