Everyone was painfully aware of Tamaki's feelings for Haruhi, even if the blond himself wasn't exactly aware of it. His jealousy and attention-seeking tendencies skyrocketed as soon as he was nearby her, and that was so, so obvious to see.

I mean, who wouldn't like Haruhi Fujioka? She's unbothered, sassy, funny... it was easy to like her, and almost everyone in the club had at least tried to get with her. Despite that, she remained single, much to Tamaki's feelings.

The other funny thing is, because of his feelings, Tamaki seemed to go blind. Not noticing what was happening right before him...