It's driving me crazy. =_= I remember that I read the synopsis in English but I can't even remember the author or publisher. It's about a girl that after a series of events with let's say Bob, she falls in love. However, later when she meets Bob again he doesn't remember her. Then there's this other guy Bill (maybe Bob's brother or twin??) who tells her not to talk to Bob about when they met.

Ok, that's all I remember >_< Does anyone know?

Moe Kare!! maybe...

The Gentlemens Alliance Cross ??

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As they played the game...I waited for someone to call "onigiri." But no one called. I was very little then. I had almost forgotten about that. [...] But they knew...there would never be room for an onigiri...in a fruits basket.
-Tohru Honda, Fruits Basket

maybe Boku kara Kimi ga Kienai

Ah I know the manga you're talking about, but I can't remember the name right now.
It's not any of the above named. Will try to find it.

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Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus

Koi*Oto?

don't know the name of the manga, but I can tell you that it's definitely not Moe Kare!!

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"In a world where most people would be crazy, then it would be normal to be crazy and crazy to be normal... but then again, if you were normal, then you would be crazy... isn't it crazy what a paradox a little craziness can create?"

Penguin Brothers, maybe?

Yes! It's Koi*Oto. Thank you fulllm00n and everyone else. I happened to be at the bookstore when I saw the answer so I bought it right away ^_^