The Swifties are crossing the line when it comes to being a passionate fanbase ... so says Travis Kelce's ex-girlfriend, who claims she's been getting death threats from Taylor Swift supporters after speaking out about her past relationship with the Chiefs superstar.
Maya Benberry -- who won the "Catching Kelce" reality show back in 2016 -- has been sharing her dating experience with the All-Pro tight end following Swift's appearance at the Chiefs game on Sunday ... accusing TK of infidelity during their time together.