Winry White's Favorite

Looking for yaoi manga, forgot the title, the story was about a girl who liked a guy in her class, later she gets paired with another guy who she hates, but laters ends up liking him, however both the guys she likes are dating, and she later sees them doing "stuff" in the classroom, but due to for her seeing them they end up "breaking up" but she tries to get them back together. The manga was also pretty short probably a oneshot, but can anyone please tell me what this manga is?