You were to right to cut ties with him. Sounds like the person who either always needs attention, approval, or feel like he's being victimized in a relationship even if he's the one cheating.
I've never heard a story like this end well without major sense being slapped into the person.
English
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Well he'll never learn, no matter how hard you slap him
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Figuratively, he'd need a mental revelation that would force a new way of looking at things. But this would require learning