buzzfeed:

The relationship between Steve and Bucky is one of my brother’s and my favorite aspects of the Captain America movies.  It’s so complex and tragic.  They have a devotion to one another that is undermined and devastated by fate, and exploring how they endure that is fascinating for us as storytellers and fans.  We feel Civil War is the best chapter yet in the story of their relationship.  The character has gone from being Bucky Barnes to being the Winter Soldier, and now in this movie he is something else.  We explore whether he and Steve can ever have a relationship again and, if so, what that relationship can be.  -AR