the manga has to be like GE: Good ending or Ginen Shounen

If you haven't read them before they both had the MC's love interest in love with someone else
The MC has to had his heart completely crushed and theres no misunderstanding. It's right in HIS(I should mention it should be a guy MC) face that she doesn't like him or is cheating on him. I DO NOT WANT HENTAI.

thank you very much for the help 😀 😀

Closes I can think of is liars paradox