Sara ((((big hugs)))) what an awful conversation to overhear. I can imagine how that must have felt and I'm so sorry.
Whether any of us choose to stand for our marriage in the face of such difficult circumstances is up to each and every one of us. However, I think the most important thing is boundaries, emotional safety and wellbeing.
You have been trying so hard to re-attract your H when he is clearly still infatuated (I'm not going to call that love) with OW.
At this point? You may want to call him right out on all of that and knock his skewed thinking right on the head.
Living like this isn't working for me H, so you'd better find another place I'm not going to ML to you and overhear you declaring love for someone else an hour later - that doesn't work for me I don't want our M to end, but I'm not willing to live like this (and I'll deal with my own fears thank you very much.)
I think you have been putting yourself secondary and suppressing and tolerating in the hope your M can be saved. It still may be if you want it to. However, I think it is time to clearly let your H know that if he wants to be elsewhere and not with you - he'd best get to it because you have a good life to live...
Believe me Sara, you are going to be ultimately fine either way and life will be much more peaceful if you lay down and maintain suitable boundaries for yourself.
Take care Sweetie xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus