Can you recommend me any bl manga that it was so so good you cannot forget about it.

https://www.mangago.me/read-manga/the_monster_and_the_beast/

Not manga but
A Painter Behind the Curtain
Not for the Faint of Heart (short but has had my heart for years)

Also
Over Run (!!)
A Trace of the Wonder
I have a shitty memory so idk others

https://www.mangago.me/read-manga/a_season_of_dusk/

I made a list with reccomendations, you could have a look!