Based on my experiences I'd not say anything.
My first b/f my mom did not like at all. What she did I still feel was so wrong. One evening she took me to his house, made me stay in the front yard, went in the backyard with him, they talked, then she came around front to get me, told me we were done and we left.

Turns out she broke up with him for me. Had planned on doing so all evening but never let me know. Seriously, I don't know what she had against him. His father was a minister and he was going into the Navy. It took me along time to get over that.
A later b/f I broke up with and she made me call him and say I'd "go with him". I don't know what it's called these days but back then (late 80's) that was the equivalent of going steady.

I really didn't care for him as a b/f but she thought differently. I ended up miserable.
I'm sure these are extreme, my mom was very controlling.
Bottom line - to an extent, I think you have to let your children make their own choices, even if it means a few tears. They need to find their own way in life. It's better to make your mistakes while you're young rather than later in life.