Because she is the only one who has shown affection for him in any romantic way, you guys are truly LuNatics if you believe nami has shown anything more than friendship for luffy.
Bro Oda himself said that there will NOT be romance between crew members
Yes, Oda also said that the luffy fruit is an ordinary rubber fruit, he said that there would be no romance in One piece and he did the opposite.

Amazon lily also spent 2 years but nothing has changed, you fantasise too much, "hancock loves her they will be together"
Really? Doesn't it matter what Luffy thinks? Does it have to be because one side likes it? That's a funny point of view.
 
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