I Was Jealous, But Not For The Person I Thought (Mattholomule x Gus)

Mattholomule and Gus hated each other, and once Mattholomule transferred to Glandus, they both thought they'd never see each other again, but they were wrong, when Gus met Bria, he was blushing around her, and Mattholomule was upset and jealous, but he didn't know why, so he assumed he liked Bria. But what happens once he realizes he likes Gus?