I never really liked short shoujo manga's most of the time I feel they have rushed endings and have quite a few cliff hangers that bug me such as, forgotten characters. (maybe it's just me?)

Well anyway I was looking for a long romance/shoujo manga that has over 100 chapters scanned, ongoing and completed is fine.
It doesn't matter if its a manga, manhwa, or manhua.

I'd prefer a manga thats not way older than me,
I was born in 89 🙂

Heres some I already know of,
Snow Drop
Goong
Parfait Tic
Fruits Basket
Kare Kano
Mars
Hot Blooded Woman
Hana Kimi

EDIT: Thanks Rainy Days some of those I already knew of but still I found a few I'm interested in 😀

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“As he read, I fell in love the way you fall asleep: slowly, and then all at once.”
_

Basara
Skip Beat
Tokyo Crazy Paradise
Lovely Complex
Nana
Perfect Girl Evolution
Red River
W Juliet && W Juliet II
Peach Girl
Kaikan Phrase
Angel Sanctuary
Vampire Game
Gakuen Alice

Fruits Basket
Hoshi wa Utau
Koukou Debut
Skip Beat
Zettai Kareshi
Imadoki!

Those are some of my favourites
Hope it helps! 🙂