
My condolences for your heartbreaking loss. I’ve been there as well. I don’t think I know which one you’re talking about but this one -> https://www.mangago.zone/read-manga/faded_first_love/ has a similar trope with one guy having a crush on a girl and another guy misunderstanding it.
Perhaps this can console your heart until you find the one you’re looking for

Just thought of this one-> https://www.mangago.zone/read-manga/kijima_kun/ it’s a bit old but it’s quite fun. This story is about a guy (the top) who sends erotic love letters to the bottom who has the same name as another male classmate
was watching a tiktok bl recommendation but my phone died before I liked it it was manga black and white, the plot was (u thinkink) about a guy giving a girl a letter but then another guy received it instead and thinks it was intended for him assuming the first guy likes him. the guy giving the letter was blond probably the uke lots of blushing and the other guy had black short hair. probably high school setting cute art style