Karmu
Anything but canon
(covers information that is anything but canon)
T'Pring tells Spock that she loves Karmu
According to an anything but canon account, Karmu was a Vulcan male that lived during the 23rd century.
Although T'Pring was engaged to Spock, she told him that she loved Karmu, and that she must leave him. During a First Contact Day celebration aboard the USS Enterprise, Spock showed the party goers a recording of T'Pring's breakup with Spock on a blooper reel he compiled for them to watch so that they might laugh. He told them that she had left him for other men numerous times, admitting it's funny because it's self-deprecating. (VST: "Holiday Party")