I'm looking for a manga in which a guy likes a girl but the girl likes some other person (boy or girl it doesn't matter).

Any Ideas

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Vampire Knight Zero likes Yuuki but Yuuki likes Kaname.
Hanazakari no Kimitachi e Nakatsu likes Mizuki but Mizuki likes Sano.
Shugo Chara! This part of the manga hasn't been scanlated yet but Ikuto likes Amu but Amu has a crush on Tadase.

School Rumble

(It's what came to me first)

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Definitely School Rumble. The early storyline practically revolves around that, but later more characters get more attention and the relationships become slightly more complicated.

Can't really think of any others since the romance genre typically focuses on one guy (or girl) and the object of their interest either has no initial interest in them or anyone else, or has eyes for them only.

It's what came to my mind first as well.

queens
stroke material
Gakuen Alice

Might be similar in a way to something I posted b4.

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Does Love Hina count?