By Tom Blow Travis Kelce claims he’s the “happiest I’ve ever been” after a big 12 months. Kelce, 34, started going out with Taylor Swift, also 34, last year. They told NFL fans they were a couple last September, and Swift has been to lots of Kelce’s games for the Kansas City Chiefs since then. There’s even a video of Kelce telling Swift: “I love you.” The tight end is doing great in American football too. His team, the Chiefs, won 25-22 against the San Francisco 49ers in overtime at Super Bowl LVIII. That was the team’s third national championship in the last five years, with Swift watching on…