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The real reason why Jennifer Lopez and Casper Smart broke up has surfaced, and it appears that SHE dumped HIM.
Apparently Casper had a choice.. either go to a charity event in the Hamptons with J-Lo, or hang with his mates at UFC 202.
TMZ has learned that the charity fundraiser event was super important to Lopez, but Casper decided to go watch the Conor McGregor/Nate Diaz fight in Vegas with his friends instead anyway.
And that was that, no discussion followed therefore, J-Lo was simply done.