If things are bad now how will they be in a relationship?

This girl Ive been hooking up with for a little over a month is a jealous type..we arent in a relationship yet though, she thinks me and her friend have something going on however, thats not the case, what im wondering is if her jealous tendancies will go away. Like is this just the beginning jitters for her because she doesnt know where we stand....or is this a forteller of the future and if shes jealous now, shell be worse when were in a relationship?