Why are men easily offended?

He used to love me long back and i didn't reciprocate. It was a bad ending for him and we drifted apart. He now clearly hates me. So we bumped in and I told me 'hello' as I know him but he acts like we never met. He was blatantly ignoring me.

But now when he knows that I am seeing someone else, he got hurt.

I am not sure what the situation is.

Why are men easily offended?
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