In the beginning, Katniss did love Gale. But around the middleish/ending of the story, she finds herself loving Peeta instead. The main reason, though: Gale and Coin were designing a bomb, and Prim was killed by the bomb. After she died, Gale realized it was over with KAtniss.
In the end, Katniss and Gale grew apart, as many childhood friends and young loves do. She needed something different in her life, and with Gale's link to Primrose's death, Katniss found a reason to cut ties.
Katniss cannot tell Gale she loves him because it will make everything much more complicated in her life. She is struggling as it is with her feelings for Peeta and Gale, and with all her worries of just keeping her family alive, love for him is the last thing she can think about right now.
Why did Katniss not shoot Gale when he was captured?
Katniss refuses to kill Gale
In Mockingjay, Katniss defied Gale's wishes when he was captured because she didn't want to see him dead. It seems like a nice thing for her to do, especially since Gale is soon able to escape out of the Peacekeepers' grasp because of the rebellion's "distraction".
hunger games deleted scenes that should have stayed in the movie
How was Gale responsible for Prim's death?
Prim was among the medics who arrived to treat the victims. Unfortunately, a second batch of bombs were set off, with Prim being killed in the explosions. Gale was not the one to drop the bombs from the hovercraft, but he was one of the key figures to devise the strategy of double bombings.
Reasoning: Yes, Gale designed a weapon, and this weapon went on and killed Prim. But this was war. Gale was trying to win, and he had no idea that Prim would be there.
He Didn't Save Peeta's Family But some people believe Gale may have had more malicious reasons for not helping them. However, Peeta's family wasn't great. His parents were abusive, or at least distant. It would have been interesting to see what would have happened had his family survived, but no one missed them much.
When Katniss comes home to District 12, Gale immediately confesses his love for Katniss, and she realizes she might have feelings for him, too — but she can't explore them, because she has to continue her fake relationship with Peeta or else her entire family, including “cousin Gale,” will be killed.
Gale is jealous of Peeta and the relationship he has with Katniss, and he wants Katniss to decide between them, though he doesn't press Katniss during her recovery in District 13. Gale is an excellent hunter and excels at setting snares and traps.
At the end of Mockingjay, Gale relocates to District 2 and begins working in the district's government. He helps train replacements for the Capitol's Peacekeepers.
Gale's jealousy towards Peeta stemmed from his feelings for Katniss and his desire to be with her. Even after Katniss became engaged to Peeta, Gale still harbored feelings for her and was unable to fully let go of his jealousy and resentment towards Peeta.
Peeta, Annie, and Beetee vote no, while Johanna and Enobaria vote yes. After some thought, Katniss demands to kill Snow. Once she receives an agreement, she votes yes, for Prim. Realizing something is up (as Katniss would never do that), Haymitch votes yes, too.
According to the star behind Effie, Elizabeth Banks, she and Haymitch's Woody Harrelson improvised the scene. Considering she's been adamant about the characters having some romantic connection, it only makes sense that they'd share a goodbye kiss. It's very on-brand for Effie, as well.
Gale, back from District 2, visits Katniss in her room and gives her a single arrow: a symbol, he explains, of having Katniss fire the last shot of the war. Katniss realizes that she will never again completely trust Gale because of her lingering suspicion about the parachute bombing.
Gale does not marry anyone in The Hunger Games. He and Katniss talk about running away together and starting a new life in the wilderness, but they never officially marry.
The love triangle between Katniss, Gale, and Peeta is a major part of The Hunger Games franchise. There always appeared to be a spark between Katniss and her best friend, but when Katniss is reaped, everything changes. To survive, she's forced to fake a romance with Peeta, a boy who lives in her district.
Ultimately, in Mockingjay, it was undeniable that Katniss was completely in love with Peeta. Even though both Gale and Peeta are great men who wanted the best for Katniss, there's no doubt Peeta was kinder, and more loyal and understanding. These qualities made Peeta way better as a character and as a love interest.
Finnick's death gave even more weight to Katniss's mission to kill Snow, since he was directly responsible for the death of one of her friends - making it all the more poignant when she chooses to kill President Coin (Julianne Moore) instead of getting to personally kill Snow herself.
He didn't volunteer because he loved her. Katniss threw away her own life to protect Prim. She is the only person Prim can truly depend on in their family. With Katniss gone, the only person left who is capable and willing to care for her family is Gale.
He explains that Peeta came to Haymitch to beg for a chance to go back in the arena and to take his place should Haymitch's name be drawn at the reaping. The two agree to work to keep Peeta alive since he and Haymitch worked to keep Katniss safe last time.
Before the Capitol battle, Gale had explained to Katniss his series of bombs designed to feed off human compassion: a small bomb would go off, and then when medical aid rushed in, a second bomb would go off, killing those people as well. Incidentally, it's this exact type of bomb that took Prim's life.
The double bomb that kills Katniss Everdeen's sister, Primrose, was designed by two rebels: Beetee and Gale, Katniss's lifelong friend. Previously, Gale had explained that the double bombs are designed to appeal to mankind's weakness for compassion.
