From Shinnen: 4i226y
Emi and Atsushi have been dating for one month now, and to be able to become one with the person you like is like a miracle. The feeling of happiness is overwhelming, but apparently, there is an unforgettable person for Atsushi. What should a person do in order to make his attention turn to one's self? An earnest love graffiti.
Other stories:
Shin Sekai
Iroha ni Hoheto
Omoware, Omou
1 Volume (Complete)

These are mangas about people realizing their loves may be unrequited, and since it's shoujo (you know they're not, unlike in my life T-T)...the MCs respond normally to this and aren't complete weak crybabies which is always appreciated.
Both stories (out so far) are about two people, with one person possibly having unrequited feelings for another AFTER having confessed, but still hanging around each other. They keep you guessing a little bit, may be a bit predictable too, but are cutely presented. Ending of story 2 will be especially whimsical!