[He briefly meets her smirk before returning to his food.]

I think it's a social faux pas to talk about exes to people you're currently dating, right?

[Not that either of them particularly care for the conventions, but still.]

Look, all I really need to know is that he missed out on the best thing that ever happened to him. That said--if you want to vent about it, I'm all ears; but otherwise, I'm not going to ask questions.