Searching for manga

The main character is a boy who was once confessed by his best friend and classmate (wataru was his name, if i remember correctly). the boy tells his classmates about the confession, because of what Wataru jumps from the school rooftop. years later, in high school, the protagonist sees a guy who is also trying to jump from the rooftop, he stops the guy and gets close to him, they start going out but than Wataru shows up. Please help