Koishi Tagari no Blue
Well, I guess there's no unrequited love in this, but it does have that learning to love each other.

The two main characters meet suddenly and become a fake couple in order to get the guy's friends back together. But the guy likes that girl, so it kinda becomes complicated. But you see, in the fake couple, the girl starts to notice feelings, but she knows he likes someone else. But then he ends up developing feelings, but along the way many problems arise.

It's a happy ending though ! Although I cried heavily for my own reasons.. :L

'It's not farewell, just a see you later'

Definitely Hapi Mari
Koiji
Please love the useless me
Shukkatsu!!-Kimi no naitei
Zettai Kareshi
Omoi, omaware, furi, furare
P to JK
Hare kon
Nenene
Hirunaka no Ryuusei
Tsubaki-Chou lonely planet