To me, it's not giving up vs moving on. It's just moving forward.
Regardless of what happen you will never move past having XW in your life esp with S. You will also will never have what you had before because M evolves. Do you aren't really giving up anything
You have to look at how you want to proceed. How you want to live from this day forward. So what do you really want
If you don't want to date and just be a great dad. That's perfectly ok....as long as you are doing it from a place of peace.
Patience is bitter, but its fruit is sweet. --Jean Jacques Rousseau.