During Sebastian Stan and Taylor Swift’s romance, the actor tells Andy Cohen he was worried about Tom Hiddleston throughout it, saying it was “one of awe and extreme concern.”

“Obsession and yet at the same time, I don’t know, I was really worried — mainly for him. Love is quick and hard,” he said of Tom and Taylor’s publicized romance, and seeing Tom wear the I Heart T.S. shirt. He didn’t talk to him about it though: “No, no I didn’t. I actually forgot about that incident!”