Ted nods - he knows. He appreciates Sherlock saying though. He loves her too, so much. So much it hurts something awful to see her like this.

"I wish I'd stayed here last night.." he says regretfully. He just needed a little space to process, and he'd rather do that than go around being cold and tense around her. And it was probably the right call, given what he knew then, but if he'd known this would've happened, he would've been here instead. But at least he could come right away..