Koimonogatari: Love Stories Vol. 2 (manga)
When Yuiji accidentally finds out his classmate Yamato is gay and has a crush on his best friend, he doesn't know how to react at first. But after spending more time together, the two of them become close friends. While Yamato struggles with his sexuality, Yuiji supports him and keeps his secret, hoping that Yamato can find a way to accept himself and be happy. Meanwhile, Yuiji is having trouble feeling connected to his long-time girlfriend, realizing that although he still cares about her, the spark in their relationship has faded.
Love is a complicated, messy thing -- especially in high school, where hurtful rumors and intolerant classmates can make life unbearable. Yamato and Yuiji face their own individual struggles, but together, they learn one very important lesson: it's hard to search for romance if you don't love yourself first.