Many of our stories are similar. I am also experiencing a H trying to do a do over. He is now living with the ow that he dated at 16. (That was 40 years ago) Left a M of 27+ years to do so just 2 weeks after he re-met her.
I, too, have felt the loss of my dreams. After over 2 1/2 years since H left,(H displayed symptoms of MLC for a few years before he left, I just didn't realize what it was at the time.) I've had to change my thinking and have some new dreams.