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You say this when you're so sick of someone's crap that you're ready to punch them in the face. They’re always messing up, lying, and going back and forth like a broken light switch. You’ve given them every chance, and they keep blowing it.
'I’m through with you. You’re like a broken toaster, no matter how many times I plug you in, you don’t work.'
'I’m through. You’re the worst friend ever. You’re like a bad cup of coffee, bitter and burnt.'
'I’m through with you. You’re like a dog that keeps barking at nothing. Just shut up and leave me alone.'