Let him go
I really love what you wrote. I am so afraid I will become one of those mother-in-laws because I have a son. He is ony 6-year-old. I love him so much. I know that one of these days I have to let him go, one of these days he'll fall in love with a woman (hopefully it's a woman, ha-ha ...), and one of these days I'll be old. I hope I will step away, let him have his own life and I also enjoy mine. It's going to be hard as I think about it now. But I have to realize he's an independent person.
