While there is a strong romantic connection between Gale and Katniss, their relationship is ultimately complicated and ultimately doesn't lead to marriage. Here are some of the reasons why:
* Katniss's relationship with Peeta: The primary reason Gale doesn't end up with Katniss is because of her relationship with Peeta. Throughout the books, Katniss and Peeta develop a deep bond, especially after their time together in the Games. This bond ultimately leads to a romantic relationship and, eventually, marriage.
* Gale's resentment towards Peeta: Gale is jealous and resentful of Peeta, perceiving him as a rival for Katniss's affections. This jealousy fuels a rivalry between the two men, making a happy ending with Gale unlikely.
* Gale's decision to leave District 12: After the rebellion ends, Gale chooses to leave District 12 and help rebuild the nation. He is disillusioned by the aftermath of the war and feels that he can make a bigger difference elsewhere. This decision effectively ends his relationship with Katniss.
While Gale doesn't get married in the books, he does have a brief romantic relationship with a woman named Lyria, which is mentioned in *The Ballad of Songbirds and Snakes*.