No, I think apparently it's just a cliche misunderstood situation.
Looks like an obvious "we're acting out a love scenen in the script" thing. There's another BL with the same, exact "misunderstanding"--only the guy doesn't die. Just dumps his boyfriend's butt.
It seems like My neighbor from upstair lol
Do you happen to know the name of this BL??
My Neighbor From Upstairs (like the other comment refers)
Do you know where to read it? i can't seem to find it
No, sorry. I thought it was here on mangago, but I haven't read it in a while (I have so many bookmarked, that if it's not updated, I lose track.)
Oh, wait, I found it on Tappytoon: https://www.tappytoon.com/series/enemy/1 The title there is His Enemy Downstairs
And it's here on mangago with the same title. Just got the title wrong. :D
http://www.mangago.zone/read-manga/his_enemy_downstairs/
Can someone please give me a spoiler ??? Did he really cheat? I'M SAD ╥﹏╥