Eagle gave you great advice!! Just ask him & not accuse, that way he won't know you've been in his emails. He has to earn your trust for sure.
To me it sounds like the OW is the fall back & not you. If you were to stay things might be different but you can't trust him right now, if he is truely committed to your R then it will work out no matter how far away you are.
I do think he is still in MLC & he is trying to run, he feels the guilt!