What was the worst break up you ever had?

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Mine was with second ex bf. I cant remember what we were arguing about, but i found myself getting strangled by him, so scratched him on the back of his neck. After that i just told him to leave and dont ever come back. Which he didn't i never saw or heard him again for 4 yrs til recently he wants to friends and he was sorry for how it ended. What was yours?