It’s no secret that “One Piece Film: Strong World” was written by Oda. While its “canonicity” is still being discussed but somewhat accepted by some (myself included), it actually gives us an interesting insight about how Oda wrote Luffy and Nami relationship
Before I get into the movie I’d like to get into some details from Arlong Park and nope! I’m not going to talk about the hat XD What I’d like to point out is a “contrast”. Luffy always trusted Nami to the point of even putting blind faith in her even he was given every reason to not to go after her. One remarkable example of this is in chapter 75 when Luffy is informed by someone trustworthy what Nami apparently did to Usopp, and Luffy not only kept holding onto his blind faith in Nami he also threatened Johnny for saying such things about her.