plsss help me find the name of this bl. I think it was in a college setting and the bottom...

plsss help me find the name of this bl. I think it was in a college setting and the bottom was blonde and had a crush on this guy and was like super obsessed with him and then they got together and then i think the bottom pulled out a gun on him because he thought he was being cheated on but turns out he wasn't cheating and the bottom was just tweaking.