help me find?

pls help me find an old bl manga. i only remember bits and pieces.
-the mc is in an unrequited love with his older childhood friend, a senpai in the same school i think.
-some tragedy happens and mc moved somewhere else.
-mc left a note i think, im not sure.
-they met again in university.
-ml kinda thinks mc slept around but not really.
-mc denying that he still likes ml.

honestly i can’t remember much so ive given up hope to find it, but if you have similar trope to this, do tell.ty