Doesn't seem odd to me at all. Growing up, I almost never heard my teachers talk about their partners or spouses or romantic relationships. I remember my year 6 teacher got married and decided to change her surname as a result – but that's all I can remember ever hearing about her marriage, and if she hadn't decided to change her surname, I doubt I would have heard about it at all.

Even now, we know very little about the romantic lives of our son's teachers – and I expect our son knows even less than we do. Even when we do know things, it is through gossip among parents, or socialising with teachers – not from teachers telling the children about it in class.