Hey ! if this is not allowed here please remove it. I read a manga a few years ago but I can not find it again. it is more shouning ai genre. it was about a boy who fell in love with his neighbor. but he moved. years later the boy finds the school where his crush is a nurse. but that school full of delinquent. he meets the nurse but it turns out to be the brother! and that's about the story. if someone knows, I am forever grateful to you !!

It sounds a lot like Kusatta Kyoushi no Houteishiki by Kodaka Kazuma.