You are alpha. You walk your own path for your own purpose. They can come if they want, or go in their own direction. Girls who are friends are pulling other girls for you to be romantically attracted to and sleep with. You don't go backwards in life from having a W to a "friend" Cut them lose and ghost them. Sad? Sad for who? Try looking at it from this perspective?... Regardless of what mistakes you made, (and I get it, there is some guilt there.) Who is the one leaving? You should feel sorry for the W for leaving a good thing and a good man. You want a quitter in your life? Someone who promised a lifetime that they would never bail on you? And when things got rough, and life threw a curveball, they up and quit, and work on themselves rather than the M?
I feel sorry for them. I feel sorry for my WAW. My mindset and abilities are getting stronger everyday while she's still fantasizing about creating her bucket list dream life while watching Game of Thrones...lol