Any recommendations where childhood friends but one goes through a huge personality change
this kinda fit your description
https://www.mangago.me/read-manga/hikaru_ga_shinda_natsu/
Actually there are many post asking about this manga sauce but neither of us know the sauce. The plot about the lone wolf uke doest not know about porn and so on. And the seme is playboy and badboy. They went to boys school. The seme took interest of uke and teach him many things. The uke so naive and fell in love with seme. The seme too but he scared that his gang know about it and he avoid the uke. The uke got lonely again and he being bullied by the seme's rival . Then the seme know about it and when he found the uke bc the uke's mother told the seme that the uke was missing. He found the uke in a warehouse with blood and broken bone.

Bro I just came back to this site and what happened to my reading list I swear I had over 2k want to reads and 500 reading… and my little notes are all gone
When bato died there was a massive influx of new users so the servers crashed and a lot of data was lost. So anything you hadn't given stars is lost forever and also the notes
Damnn thx for explaining