Captain America's brief romance with Sharon Carter (Emily VanCamp) in Captain America: The First Avenger love interest, Peggy Carter (Hayley Atwell).
much to the disgust of Peggy Carter actress Hayley Atwell, who felt it was "disrespectful" to Peggy. Sharon Carter hasn't been seen since, and it's not clear if she ever met Captain America again.
Steve's relationship with Sharon is the fundamental problem with how becoming Peggy's unnamed husband from Winter Soldier truly would have been an ending that felt right for the character.
Moving on is a theme that persists throughout Avengers: Endgame and poses a challenge for multiple characters, some in more ways than one. Everyone, including Steve, is of course trying to recover from the snap that wiped out half the universe, but it's indicated in the movie that this isn't the only thing that haunts him. Cap's inability to let go of the past is illustrated when he and Iron Man (Robert Downey Jr.) travel back to the 1970s to steal Hank Pym's Pym Particles. So it's that near-encounter with Peggy that reminds Steve of what he lost.
Due to the importance of Captain America's legacy and his story in the MCU, Marvel Studios could potentially address the issue when The Falcon and the Winter Soldier. The series could find a way to downplay Steve's relationship with Sharon and reinforce the notion that Captain America's Endgame ending was exactly what Steve needed.
