how do you think about the main chara Katsuragi?

in the new chapter of the world god only knows. the last chapter, ka refused chihior's love, and he said he was only tricked her. for a girl ,for a girl who was ready to accept the loves' relationship, it's a big strike to her. it's so cured. and Ayumi asked Ka, why did you say such a thing to chihior, she want the anwser, but what she got from ka, is that reason: cause i found the most important person is ...is me!!!
sign、、、well, he broke two girls' heart. he was so timid and cured. and when the girl heard his words ,it seemed so cold.
but why did ka say such a thing? well ,well ,in the world god only knows, we get that message is that ,he replied to Diana, that only one left. maybe he thought the work what he was doing will be ended, he might feel some disappoint? or he think of another question?
well, i think the boy ,ka ,maybe have think of what he was doing ,is right or wrong/