I said no. I cannot change past I can only do things different here on out.
I said the same thing to my H yesterday, when he again brought up me shutting down after the birth of our first child. I also said that if It leads us back together, even better.
This detaching is extremely hard, especially when they're still at home. I, like you, don't think there is an OW, yet. But then, I could be wrong.
GAL is hard, I've put my entire being into my kids the last 20 years (part of our issue, but H never tried to join us, or take some of it from me, either). I didn't know where to start. So I went throughy phone contacts, picked a few people I trust, and reached out (VERY hard for me, I a very private person). I picked good.
Try going the your phone contacts, anyone that you've enjoyed hanging out with in the past? Reach out, tell them your sitch, tell them you need help GAL.