[He straightens. Good, something he can talk about.]

Without explaining to you that the metahuman angle you'd been clinging to about the Blur was wrong, and he was an alien, and consequently the Earth was being invaded by people who just show up out of nowhere claiming to be Clark's friend.

If I'd told you you'd have worked it out, and it was all about avoiding that. I can't pretend to you that protecting my secret hasn't put people in danger more often than not. That it's not a burden.