Em, your situation mirrors mine. I'm now very happily on my own, recently retired and about to start looking after my grandchild on a part time basis when his mum goes back to work.
But. And it's quite a big but, I was this week thinking that I probably now will never be the object of a man's total, unconditional love. I'm very aware that neither husband nor long term lover were able to give me that. And now that I've thought about it, it's stayed with me (especially after a glass or two), and although I'm not stressing about it, I have wondered what it would have been like. Of course, the other side of this coin is that maybe I'm not the kind of woman who is particularly 'lovable', and in fact I am happier on my own. Mind you, without said husband, I wouldn't have my two most marvelous daughters, and now wonderful grandson.
My sensible head tells me that I'm very fortunate and to count my blessings.