I forgot the name of this yaoi. It was about guy A who was in love with guy B in high school and when he confessed, he was bullied by guy A's friends. The story begins in the future where they meet again but guy A doesn't remember who guy B is... so they just interact normally. In the end, guy A realizes who guy B is and wants to value his feelings (and the love letter he received in high school), but guy B tears the letter apart and throws it away. Guy A is in the rain picking up the pieces... I'm sure it was a story inside a manga, there were other stories as well. I thought it was something Ootsuki Miu did, but I couldn't find it. Thank you!

Edit: lmao, as always, as soon as I post here I find the manga. It is Paradise Baby by Ootsuki Miu... I was 100% sure this manga didn't have 2 stories inside, so I didn't check it. Ha...