Sebastian Stan Was 'Concerned' For His Avengers Costar Tom Hiddleston When He Was Dating Taylor Swift! WATCH!

With friends like these, who needs enemies?!
While appearing on Watch What Happens Live! with Andy Cohen, Sebastian Stan answered a fan question about his reaction to his Avengers costar Tom Hiddleston‘s relationship with Taylor Swift — and his response is priceless!!
Watch (above)!
[Image via YouTube.]