Why did he get offended if I no longer flirt with him since he’s in a serious relationship?

We have history, used to flirt a lot and we’re very close. Since we met up a couple of years later I no longer act the same around him since he’s in a serious relationship now (planning engagement etc), yet when I refused he became defensive and upset like I was being mean to him or something? How is this justified in his head?
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Why did he get offended if I no longer flirt with him since he’s in a serious relationship?
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