"You don't know that."

It could be a challenge, but it's not; it's apologetic, wistful, instead.

Apparently Mary Margaret has faith in her, too, but whether she deserves it is another question.

It's just hard. That's the problem with actually liking the guy: it sucks to have to pull away because she knows that it's the only way to save everyone involved worse things down the line.

Better to just not start anything at all.