Star-Lord and Gamora

Gamora and Peter Quill are both part of the Guardians of the Galaxy. They First Encountered each other where Gamora was sent to retrieve the orb from Peter. Soon They both became close and began to have romantic feelings for each other, becoming romantically involved at the end of Guardians of the Galaxy Vol.2.

When they first met, Gamora tried attacking Peter for the Power Stone contained in the orb and Peter began picking up a fight with her. During their brief imprisonment in the Kyln, Peter learned many people in the prison wanted Gamora dead due yo her association to Ronan. He later saves her from being killed by Drax the Destroyer, and convincing him to spare Gamora in order to lure Ronan, the man who killed Drax's wife and daughter.Throughout the film, Peter and Gamora slowly warm up to each other and developing potential feelings for one another. After Ronan stole the orb, Peter and Gamora finally became Friends after Gamora said she was happy to die among her newfound friends. Gamora immediately went to save Peter without hesitation when he was seemingly being ripped apart by the Power Stone.

Gamora also had fallen in love with Peter, but she wanted to keep her feelings a secret. By the second film, Gamora and Quill are closer than the original and are best friends but both keep their attractions toward each other a secret. However, no matter how many times she denies it, Gamora has a romantic attraction to Peter Quill. He would also often tell her a story he'd tell all the children: that David Hasselhoff was his father. On Sovereign, Peter begins apparently flirting with Ayesha, but stops when he notices that Gamora is looking at him, telling him to "shut up". She shows a hint of jealousy when she sees Quill flirting with Ayesha the High Priestess, but says nothing about it. However, she does interrupt their exchange before the conversation grows any further.

Mantis later identified in front of Gamora that Quill was romantically in love with Gamora. However, when Peter did confess his feelings for her, by asking what they would do with their "unspoken" thing, but it turned into a fight. Gamora worried for Peter's safety when they learned his father, Ego, killed all his children. Later, Gamora submitted herself to Peter Quill and they began a sexual, romantic relationship as Boyfriend and girlfriend.

However, the two of them admitted their love to each other too late. When Thanos kidnapped Gamora anda told her boyfriend to take the shot, Gamora admitted she loved Peter more than anything and in return, he loved her too. However, Peter failed in killing Gamora when Thanos turned Peter's blasts into bubbles. After learning of Gamora's death, Quill attacked Thanos, but the result ended with Thanos snapping his fingers and ending half of life in the Universe.

Quill thought he met Gamora on the battlefield, but he met a Gamora that hadn't encountered him yet.

Trivia

 * Gamora's and Peter's relationship mirrors Vision's and Scarlet Witch's in Infinity War. Both Vision and Gamora beg their lovers to end their lives so Thanos does not get a certain Infinity Stone that they keep secret. (The Soul Stone and the Mind Stone) Reluctantly, both Peter and Wanda tried to kill their lovers at their requests to protect the Infinity Stone. However, they ultimately fail due to Thanos tampering with Peter's blaster and undoing Vision's first death and he ends up getting the Infinity Stone anyways.