After moving to Ouran Academy and joining the Host Club, when Tamaki found out you're a girl, Tamaki has been extremly clingy and protective over you.

Was he doing this for fun? Or was he hiding something that he didn't want to admit?

You've already gotten used to his actions so you don't get bothered. The club members really enjoy your company a lot, especially Tamaki himself of course. He just can't get enough of you.