[Why is it, even when talking about someone else's love life, Mai still gets the underlying feeling she's the one being (lightly) teased?]

Oh. I...suppose congratulations are in order then.

[As they weren't particularly close, she felt no insult at not having been invited to any ceremony.]

It's just...it's been a while since I've heard about people getting to celebrate something like that. [This much, at least, was true. There was no time for weddings or parties when you were literally fighting to stay alive each day.] Not even back home, let alone here.