I'm out
Used to convey "It's over between us" or "I'm officially breaking up with you" (sometimes in the form of a threat) usually to a short-term partner.
Example:
"He didn't even realize what he'd done wrong so I told him 'I'm out' and wished him well."
"If you don't stop sleeping around, I'm out!"
"He didn't even realize what he'd done wrong so I told him 'I'm out' and wished him well."
"If you don't stop sleeping around, I'm out!"