Totally agree. I’m surprised on the number of people who get so close to their kids SO’s in high school. Being kind, polite and welcoming - yes, but encouraging such a serious long term view - not for me. One of my kids (college) has a serious GF and she’s wonderful, but we stay out of it - while being kind, etc. But we’re not inviting her to come on vacation with us anytime soon, for example.
They have time to explore relationships in college, I feel like the kids who are bogged down with an mature committed relationship in high school end up with a lot of regrets later.