Khloe Kardashian and Tristan Thompson have broken up, and TMZ's learned the split happened shortly after allegations spread last month that he cheated on her again.
Sources close to the ex-couple tell us ... they called things off a few weeks ago, not long after a woman named Sydney Chase claimed she and Tristan had sex after he had reunited with Khloe.
As we told you ... Tristan shot down the claims and threatened to sue Chase, but he didn't go through with it.