Why guys do this WHILE BREAKUP?

I dunno if this is a guy thing, I dont hear females do it as much.
But why do people in general disregard reality when they breakup?

When my ex broke up with me he said "it was ONLY 6 months, nothing happened"

This guy would cry to me and nobody else, he planned our kid's future and even the schools they would go to, he said he loved me and did the most loving things without me asking. He was willing to cut off his fmaily for me.

Why would he in the heat of a breakup say such hurtful words? as if the relationship was basically nothing?

Why guys do this WHILE BREAKUP?
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