When Cole backs down from trying to date Nya, and Nya finally goes and dates Jay again.
Nya and Cole have an even stronger relationship than they did before they started kinda liking each other.
You can tell that they've become very close as friends, especially in season 6.
Now they are very close friends and have a brother-and-sister relationship that is stronger than the rest of the ninja (besides Kai of course) and also besides Jay since she's dating him.
But I imagine that Nya has a brother-and-sister relationship with Zane, Lloyd, and Cole and that her relationship is stronger with Cole than the other two.
In her time of maybe dating Cole, they each learned more about each other and realized that they weren't good boyfriend and girlfriend but good best friends instead.

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Ninjago Head Canons
FanficThe title says it all a bunch of Ninjago headcanons (REQUESTS OPEN) UPDATE: I'm just going through and editing the formatting and adding some more to a couple of the Headcanons, only minor things just to make it more interesting and easy to read. T...