I'm struggling at times, but I just think after a while you gotta say 'F it', and focus on yourself (and kids).
One 'trick' that's seems to help me some is, every time I start to feel sad for the sitch, the demise of 15 years, the future plans, etc, I think to myself 'this person doesn't feel the same or share the same plans. Why would I let myself be hung up on someone like that?' It at least turns my mood from sadness to anger. After a while, my anger has lead to somewhat of an acceptance/detachment.
This probably isn't the best route to go, but I think you gotta find something that works for you. Something that keeps you from dwelling on the negatives of your situation. Whether that's GAL, some kind of mind trick, etc.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712
