She "felt" invisible, talking wouldn't matter, you won't change, you'll just try to fix her....you don't see things from her perspective. She already detached, she was tired of trying, she lost her attraction, she needed to walk because she felt unloved. The pain of staying was greater than the pain of leaving.
You need to get ahead of her on the detachment curve. Face your brutal reality. If you don't change she just validates how much pain you cause her when she sees you. Make yourself attractive to her, quit thinking about her, be your own man.
"What is best for my kids is best for me" Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712