i can see it playing out as he probably never paid much attention to her growing up with their age difference with the exception of hi and bye, but was usually busy with his own friends and what not. they could’ve had a brief fling prior to meeting her child’s father. with her being around a lot, it could be one of those “let’s not talk about it.” now as adults though, he’d consider her a friend and be super nice to her son. if you wanted to set up a custom to discuss timeline or anything else, that would be fine, too!