You and Sanji never got along, you two would always fight no matter what, even when you two are fighting enemies together you both are still fighting. Nami would always beat you two up when you would start to argue, yet this gave her a plan. Nami forced them to be roommates for a while. And a little secret, all though Sanji hates you... He's hiding certain feelings.

"Ugh why did Nami force me to be roommates with you?"