Breakup

A breakup was the end of a romantic relationship.

Jonathan Archer stayed in touch with his ex-girlfriend's mother after the two broke up, which led to her contacting him about a puppy when her female beagle became pregnant. (ENT: "A Night In Sickbay")

In 2259, Spock's breakup with Christine Chapel was the subject of his song "I'm the X". (SNW: "Subspace Rhapsody")

In 2371, Kira Nerys thought Jake Sisko was asking her advice about Mardah, only to learn he was interested in her, he and Mardah having broken up. (DS9: "Fascination")

In 2373, The Doctor suggested Kes' interest in Zahir was a reaction to her recent breakup with Neelix, suggesting that Mahatma Gandhi would recommend a cold bath. (VOY: "Darkling")

As of 2374, Shakaar Edon and Kira had broken up over a year ago, and still Odo hadn't made his move. (DS9: "His Way")

By 2375, B'Elanna Torres and Maxwell Burke had been broken up for over 10 years. (VOY: "Equinox")