Friends.... He has two friends here, right beside him. And he trusts them more than he trusts himself about being a person. They could at least recognize they are friends when Thanatos isn't sure and questions it.

"But what about all the mortals back home? What about Zagreus? I can't... I can't just forget. About him. We..." Thanatos doesn't know how he wants to finish that sentence, and Mort squeaks in sympathy. "Even if I knew it was wrong. Even if I knew I risked everything in doing so, I still wanted to help him. But, now... now what?"