Some good ol’ yandere stuff?

https://m.webtoons.com/en/thriller/my-deepest-secret/list?title_no=1580 Yandere with a twist (▰˘◡˘▰)

This is my favourite male yandere list but all the manga series are yaoi if you don't mind that.
http://www.mangago.zone/home/mangalist/460529/?filter=&page=1