@nathaneskell I like both of these reasons but the "crush" reason doesn't really fit in, J has always been viewed as the workaholic who tries her best to meet expectations, and J is smart enough to figure out that N likes V, so I'm guessing that J is just jealous of N for getting most of Tessa's attention, and that N Is always laidback and kind no matter the situation,
In short: J is jealous that Tessa gave N all her attention, and is also jealous that N is always the same old kind guy even against enemies