Regarding being alone... I do not feel any more alone now then I ever did in my relationship with husband. We each went our own way when we were together. HE told me, "nothing will change for you" and he was right.
I cant even fathom what it would feel like to have a partner. It feels like its been so long. I was jealous when another mom said "i have to ask my husband what he thinks". Or seeing a mom and dad joke around and enjoy their son at a cubscout meeting together. (my ex would never have went with me, although he would have taken him if I was in work) I have gotten used to not having someone else's input. And even when he was around, he was not someone I actually connected with. He wasnt interested. He just wanted to get through the conversation, like it was this chore for him.
You are right though. Why waste our time consumed by someone that just does not want it?