The Ninja Reader

"I don't like him anymore, if that's what you're really asking. But yes, at one time I did, and it was clear that he did not return that particular sentiment, so I backed off," Amar (Four's former instructor) says. 

 

- Allegiant, p. 356

Translation: I expressed a romantic interest towards a teenage boy I used to teach. He was on the run from an abusive home situation and he obviously carried quite a lot of demons.

Well, goodness, Amar, it was sure nice of you to back off as you put it. Hard to imagine what would have happened had you not respected Four's boundaries. 

And how, pray, did you find out that he did not reciprocate?

(I swear, I'm not trying to read things into the text, but the book just keeps serving stuff like that, I can't even!)