When I finally had proof of what I suspected, it was devastating at first. But it gets easier. I focused on the big picture, MY end goal, which was reconciliation. I re-framed it to look at it as if this was a new R, the new person would have been with others before at my age (I hope, lol), so this affair behavior/replay crap is "before our new R"...and even before we got M originally, we both had been with others, and that didn't affect our new R and M together.
That's what worked for me, hope you find something in there that is useful.
Like you I thought the online cyber boy-toys and EA were bad enough, the PS proof was hard...but the people here helped me through it, kept me to my own words.
It is better now. I think of it and it affects me hardly at all...just maybe a twinge of something, but NO PAIN.
Hang in there!
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