these are pretty popular (i think?) so u might have read them already but if u havent u should check them out! and yes all of these have a happy ending
broken season: gosh not only it is a sad story (and frustrating) but the way the author words stuff is so depressing and beautiful
i will be waiting for you in 1999: aghhhh sad sad sad sad, though if u havent read this i will warn u that the happy ending only lasted for 2 seconds
:( so to me it wasnt enough to take away all the pain
a guy like you: ok so actually im not sure if this is sad to others, but it made me sob so muuuuuuuchhhhhh. it has a weird storyline but a great plot
once again all of the ones i mention are popular, plus i saw that u read over 200 stories lol so u’ve probably read these

Please give me recommendations of mangas that would make my heart throb--- FROM PAAAAAIN--- but with a happy ending. Thank you! (⌒▽⌒)