She wasn't the only one who felt their guilt being compounded by the people around her. All he'd said to Heather was that Anna had been through a lot. He wasn't making out as though that made it okay for her to have said what she had, only that it might explain it. And she'd taken it completely the wrong way.
"You're not upsetting me. And you seem to be about the only person I'm not upsetting. If that counts for anything."