I need help

Hi I lost a story and i cant remember the name. Its about 2 bestfriend who finish high school and the last day of school one of them confess his feeling, his bestfriend reject him badly and everyone makes their lives. But the one who rejected his friend gets sexually assaulted and continues to sleep with violent guys to punish himself for breaking his friend's heart.
this is the story i hope somebody know the tittle (=・ω・=)