Was I too harsh in the way I dumped him?

During an argument on the phone my ex told me he wanted to "smash my face in" and I was so appalled, I basically dumped him over text right after as I felt I didn't owe him anything after he said that. He has mental health issues, and some people are saying I should've let him down easier so I'm feeling kind of guilty about how I went about it. Thoughts?
Was I too harsh in the way I dumped him?
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