Ankh doesn't need words to reply to that last bit. The look he gives him pretty clearly asks whether he's sure about that. This isn't just about Ankh, that's for sure.

"Why should I? So you can try to fix me while you keep ignoring everything that's wrong with you?!" What good would talking do? It's just one more thing for Eiji to worry about when he already does more of that than he needs to. "I thought you were busy enough with everyone else in the world."