Avengers: Endgame set up an interesting problem for Guardians of the Galaxy Vol. 3 by bringing back a different version of Gamora. Unlike the main Gamora, who was killed in Avengers: Infinity War, this Gamora was plucked from her timeline and stranded in this universe. Because she does not have a history with the Guardians, she does not reunite with them at the end of Endgame. Instead, she starts her own journey while Peter Quill is left mourning his dead girlfriend despite the existence of another version of Gamora in his universe.
Source：https://www.cbr.com/guardians-of-the-galaxy-3-resolves-peter-gamora-romance-problem/
