Timothée Chalamet appears to have once again chosen his beloved New York Knicks over his girlfriend Kylie Jenner, stepping out Monday night at a playoff game in Madison Square Garden instead of joining Jenner uptown at the Met Gala. Last year, Jenner, 28, walked the storied Fifth Avenue steps solo as Chalamet, 30, stayed home to watch the Knicks play the Boston Celtics in Game 1 of their series. In a subsequent podcast appearance, the Marty Supreme star said he was too “locked in” with the Knicks to attend fashion’s biggest night with his partner of three years. "That Knicks run last year, I think that was the most fun period of my life. Those four months, I’m not even kidding. Just the Garden being electric,” he explained. On Monday, the Knicks took on the Philadelphia 76ers in Game 1 of the Eastern Conference semifinals at Madison Square Garden — just a few miles downtown from The Metropolitan Museum of Art.…