All I remember is that it's a little old most definitely in the 90's and it's a about a group of kids who make a clubhouse and have little games/fights all dealing with the nights of the round table and king arthur and things like that, and the main character makes friends with the new kid in town, then later on he finds out that the girl he's in love with likes the new kid and he starts hating them and leaves the clubhouse then saves them in the end from a robber or something like that, I might be wrong about the ending I don't know, any help would be much appreciated

Not quite sure if this matches your description exactly, but a quick search brought this up: Kids of the Round Table (1997) - IMDb

Thanks, but that's not it :/ I already tried that one

Do you know any other details? The movie search site - The Internet Movie Database (IMDb) - doesn't list this movie using that description.