Last week we reported that Rihanna gave Chris Brown an ultimatum to dump his current girlfriend Karrueche Tran, but that did not end well for RiRi.

A source inside RiRi’s camp told Urban Islandz that the ultimatum expired last weekend but Chris Brown refused to dump Tran. Brown instead took Karrueche Tran to Cancun, Mexico for a vacation, leaving Rihanna behind in tears.

“Rih is madly in love with Chris and it’s very hard for her to get over him,” the source said. “Whenever there are no cameras she would shed tears and go depress for days. Seeing him with her partying last weekend in Cancun was very devastating for her, but she is not giving up,” the source added.

A distraught Rihanna took to Twitter yesterday and post some lyrics from Sizzla’s song “Dry Cry.”

“Dry cry, even tears… even my heart cries, but who cares?! Whose fault? No one, but myself!,” Rihanna tweeted.

Just two weeks ago Rihanna and Karrueche Tran were involved in a nasty Twitter fight, ignited by a photo the “We Found Love” singer tweeted. The photo showed bag of rice cake wearing sun glasses and gold earrings, which fans interpret to be a jab at the Asian model. Tran later revealed that she has been receiving death threats from Rihanna fans.