Almost two years and I'm still Team Stancy.
Since the Duffers made Nancy's heart beat again for Steve and dug Jonathan's grave, she should stay with Steve.
If they had wanted Nancy to continue with Jonathan, they would not have given her so much chemistry with Steve, I am one of the ppl who thinks that all scenes are for a reason and it is evident that Steve and Nancy in S4 were delighted. Even when Jonathan returned, Nancy couldn't help but feel nervous when talking about Steve.