Girlfriend threatened to cheat and sleep with other dudes.. so I left her. Right decision or too harsh?

I just feel like If she threatens to cheat it's a massive insult and she is clearly not happy.. so to her surprise I said fuck it lol I'm done with you.

I feel like it put her in her place but I also think it's harsh at the same time. I think I will leave her to teach her a lesson for future guys she dates that you can't threaten to cheat on someone because of a very small row.

(BTW she knows my weakness is if she was to cheat so she uses it as a tool to threaten me)
yes, right Decision
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no, too harsh
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Girlfriend threatened to cheat and sleep with other dudes.. so I left her. Right decision or too harsh?
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