This page contains information regarding Star Trek: Strange New Worlds, and thus may contain spoilers.
Although T'Pring had been bonded to Spock as a child, she preferred Stonn instead, and claimed Kal-if-fee at the koon-ut-kal-if-fee wedding ceremony in 2267. Spock would have to fight for her and Stonn expected he would be T'Pring's choice as champion.
When she chose James T. Kirk as her champion, he protested, but was ordered to be silent by T'Pau, who was the master of the ceremony. T'Pring's choice of Kirk as her champion ensured that Stonn would be her consort, because neither Spock nor Kirk would want her if they won, and even if Spock did marry her, there would have been little difference because he would be gone most of the time and she intended to have an affair with Stonn anyway.