Looking for a BL

It’s about this high school teacher and this gay student. In his earlier teaching years there had been another gay student he had helped and I think he lied by saying “I’m gay too” so that the student would feel better. They became really close to one another but the student developed feelings for the teacher and confesses in the teachers lounge I believe. The teacher rejects him and the student commits suicide. A few years pass and now the teacher has another student that likes him and the teacher kind of feels like it’s supposed to be a repentance kind of thing?