Neville looks up at the ceiling, blinking rapidly, and Hermione realizes that he too has private, personal memories that he would hate to share. She wonders who’s in them, and then feels guilty for even being curious.  That’s why Blaise is crying, thinking of someone watching some treasured, private moment as if they’re watching Muggle television. She’s got a few memories of her own – Viktor, Ron, a Muggle boy one summer, even Cormac – but while it would be embarrassing if those memories are shared, it wouldn’t be heartbreaking. None of her romantic relationships have resulted in a memory she looks back on with anything more than nostalgia. It would be different if she’d been with someone she loved the way Blaise seems to love Theo. If it had been Draco.