Kanye West & Amber Rose
Cause: The demise of Kanye and Amber's relationship is a little bit of a he said she said scenario. There are people who say that Kanye and Kim's now infamous relationship started a little earlier than we all think and some who say that Amber's overall ratchetness (read as infidelity and theft) lead to the breakup.
Currently: For as highly publicized as this breakup was, it seems to have worked out pretty well for everyone involved. Kanye got Kim, Amber got Wiz, they all got children, and we got My Beautiful Dark Twisted Fantasy.