Let the OW issue go for the foreseeable future...in my opinion. It would possibly induce guilt and pressure, and point right back at you causing his discomfort. It might signal to him that the "old" you is returning, and you don't want that. He has already said its done with OW, right?
LET.IT.GO. Keep to the high ground.
T^2
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm
