Just jumping in here. I ain't no spring chicken but yet I can't imagine I'd feel different if I was 20 years younger and this happened to me.
I dated a lot before I was married. I had a lot of fun. Nothing too serious. When I met H, he was interested in me, but me, not so much. I liked him as a friend.
When I finally fell for him, I fell hard. We married and I didn't miss my single life even though I was an instant parent. I never looked back.
Now, even though H has been gone over 2 years I still can't think of being involved with someone else even though I desperately miss that part of my life.
Do I judge anyone else for how they handle their life after their S abandons the M, hell no. It's not even a moral thing that keeps me from moving on. It's that deep seated connection I feel to H that I can't seem to make myself let go of. It's all the life we shared together, the good and the bad for almost 30 years.
Obviously, I was the more connected one. Maybe a D will make a difference? IDK, maybe I need therapy.