im lookin for a manga i used to read. its about a childhood friend. the fl is strong but she looks cute. the ml (her childhood friend) acts weak in front of her but in truth he is also strong. fl always thinks of ml as a pure person that needs to be protected. behind his facade though, ml likes fl and he wants to do "things" with her. and there's also this idol girl in their school that purposely made a rumour in media about herself liking the ml, making the fl sad. the idol girl didn't really like ml, she just dislike fl because the idol girl's crush is all over fl. pleasee help me lol, I've been searching in every page with every possible tag in my usual web, but i couldn't find it :'(

I'm not really sure as I only read few chapters of this one, but the first half of what you described reminds me of Ouji-sama ni wa Doku ga Aru.

This sounds like "That Unexpected Side to my Childhood Friend - Watch Out for the Animal in Him!' it's a smut one that sounds like what your describing.