HALP ME

so a while ago i read a manga that was in the yaoi genre and for the LIFE if me i can't remember the damn name. So i was wondering if ya'll could help.

details about manga:
So i don't remember everything but here is what i can provide. it starts with i think the uke looking at his crush or something along those lines, but after a party and a drunken confession they start dating but the uke is mentally unstable and when he sees the seme talking to a girl or guy i don't remember, the uke invites him over and pulls a gun from his drawer and threatens to kill him and then kill himself if he leaves him, the seme, making a smart choice says "fuck this" and leaves, and then years later they run into each other.

That's about all i could provide i read it about a year ago, and it might has been removed from mangago but i still would like to know the name so please help me! Thank you! (=・ω・=)