Just a one shot idea

Yn ln was in a loving relationship with his girlfriend aka his childhood friend but it didn't last Yn saw his girlfriend having sex with his male best friend after seeing that Yn return home as his ex girlfriend explained that she loved Yn but never truly loved Yn but had feelings for his male best friend Yn tell his ex girlfriend to leave never called back text back be near him he wants nothing more to with her and his ex friend Yn joins the military since he has nothing to lose and doesn't care if he dies in war Yn promise himself to never love again

Yn ex girlfriend