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In a weird way, I see Kinji's half-assed attitude as an indicator that his character development is not final yet. Sure, he might have made lofty promises but that was him under the influence of Hysteria Mode. That he is painfully aware of the things he said under that mode meant that deep-down inside him, he agreed with his Hysteria mode self. But when he faced extreme situations in his normal self (like Reki's sniper restriction), his heart wavers and he snaps back at Aria even knowing that is not right of him.
In my opinion, if there ever is a time where he can declare his love or not be such a jerk outside his Hysteria Mode, it will signal the beginning of the end of the series. This method of portrayal may not be the most convincing one, but it surely explains why his attitude swings back and forth throughout each volume.
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