Sebastian Stan was 'really worried' for Tom Hiddleston when he dated Taylor Swift

Actor Sebastian Stan (left) said he had 'extreme concern' for friend and co-star, Tom Hiddleston, when he dated Taylor Swift. (Reuters)

Sebastian Stan never hopped on the HiddleSwift bandwagon.

Asked what he thought about seeing Tom Hiddleston rock an “I Heart T.S.” tank top in the heat of his 2016 summer romance with Taylor Swift, Stan, 35, said he was concerned about his “Avengers” co-star.

“It was one of awe and extreme concern, obsession and yet at the same time … ,” a laughing Stan said Thursday on “Watch What Happens Live with Andy Cohen.” “I don’t know, I was really worried, mainly for him.”

After meeting at the Met Gala two years ago, a smitten Swift, 28, quickly took up with Hiddleston, 37, shortly after her breakup with boyfriend Calvin Harris. Following a whirlwind, globe-trotting romance, Swift and Hiddleston called it quits in September 2016.

“You know, love is hard and quick,” Stan added.

Hiddleston maintains his short-lived romance with Swift was not a sham.

Taylor is an amazing woman. She’s generous and kind and lovely, and we had the best time,” Hiddleston told GQ in March 2017. “Of course it was real.”

This story originally appeared in the New York Post.