I appreciate each reply but would like to hear more experiences or advice from parents with 18+ young adults away at out of state colleges (currently or in recent years) as high school or local college dating experiences are very different in most ways.
I wouldn’t want to intervene in any way but would like to know how to support with respect for their boundaries so if it turns out to be a serious relationship, there are no bruised feelings but loving anticipation for joining the family. From my life experiences and observations, keeping good relations with their SO/spouses is one of the best gift one can give to their adult kids.