Eli kept secrets. Of all of the things that he never told her, he knew that she was aware of that fact. Sure, most of them were in relation to his work and required to be secret, but that didn't mean there weren't personal ones as well. "Oh I have no intention of dying." It really wouldn't surprise anyone to know that Eli had considered some sort of fail safe to make sure that he could even control that possibility. Except he hadn't quite taken it to the extreme. Not yet at least because apparently there were some lines he wouldn't cross.
He folded his hands considering the later question - what he did suspect? "You consider yourself a danger to him, and you still spend time alone with him?" His voice was calm, not so much accusing as stating a fact. There were still things he needed to figure out and although this had caused the problem between them, he needed to understand where she stood.