It was a yaoi/BL manga. It’s a one-shot.
There are two childhood friends. Friend A likes friend B. Whenever Friend A needs to borrow cash for the vending machine, they’d always ask Friend C. Friend B is sad because he believes Friend A is in love with Friend C.
Friend A becomes sad when he sees Friend B&C hanging out one-on-one and thinks they’re in love with each other.
I read this a while back so my memory is hazy.
Person A has unrequited feelings for their best friend. The two have a FWB situation until person B suddenly calls things off. They don’t see each other again until college where they once again restart their FWB relationship.
How do I get Dear Stranger