"Maybe if I had loved him I would have been jealous of him. You were. Maybe—maybe love makes you suspicious and doubting. Is it true that when you love a woman you are never sure—never sure of her because you aren't sure of yourself? I can see it pretty clearly. I can see how you loved him and what it did to you. I did not love him. Maybe he loved me. He tested me and hurt me and punished me and finally he sent me out like a sacrifice, maybe to make up for something. But he did not love you, and so he had faith in you." (7.3.177)
Welcome to Opposite World, where nothing makes sense. Seriously, trying to figure out love makes our brain hurt. Okay, so Adam didn't love Cyrus; but Cyrus loved Adam and therefore paid more attention to him, which for Adam was a negative thing. Cyrus didn't love Charles, but that meant that he could rely on him because he didn't care what he did. And finally, Charles loved Cyrus, which made him doubt himself when that love wasn't returned. Now things are starting to become clearer—namely, that love triangles are the worst.