i already met all the requirements and did everything else, it still didn't unlock the love level 3 for nami
Well, that's all it takes to start a Love Level 3 event for Nami. I'm thinking of two possible problems: either the wrong version of the game, or Nami's Love level is lower than Slave's, which means you've switched to the Slave route for her.
im on 3.7 and i didnt switch to slave