Travis Kelce sure sounds like a guy who's in love ... 'cause he just raved over his relationship with Taylor Swift -- straight up admitting he "couldn't be happier."
Stephen A Smith grilled the Kansas City Chiefs superstar on his feelings on his girlfriend for several minutes during a recent sit-down on "The Stephen A Smith Show" ... and check out some of the 35-year-old tight end's answers, he certainly seems smitten.
Kelce told the ESPN analyst he and Swift are "in a strong relationship" .