Do men actually regret loosing a good girl?

Seriously, if a man has a great girlfriend and she was the best why would he leave her in the first place if he will regret losing her, like if she is good and nth wrong what makes him wants to leave her, why would he regret leaving her when he made that choice, and even if he did regret losing her and wanted her back, what makes him gonna change and not leave her again
Do men actually regret loosing a good girl?
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