Some celebrity couples are matches made in heaven. These were pretty much the opposite. Just in time for Valentine's Day, here's a rundown of 14 toxic twosomes we can't believe were ever together.

Rihanna and Chris Brown
Rihanna and Chris Brown dated for two decent chunks of time, the first of which ending after he beat her senseless. Never a good sign. Nor was taking him back after that, but she's moved on with Drake ... thank goodness. Good luck, Karrueche!
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