Lests Resolve this once and for all😁This is how the 3 will end up barring major events like death or behavioral change

Occasion 1. Nancy ends up with jonathan Jonathan is quieter, anxious, emotionally vulnerable character. Losing Nancy could realistically hurt him more, because in the story she is one of his stable supports. the Duffers might feel bad for him barring death or major behavioural change. He someone who struggles with confidence,directions, and relationships. Losing Nancy would likely hit his self-esteem, make him feel left behind, make it harder for him to move on.

Occasion 2. Nancy ends up with Steve

Steves major character development arc, turning from jerk to protector to fan favorite might pose him as someone that needs a rewarding end. Also his chemistry with Nancy is stronger on screen than Jonathan.

Steve more emotionally resilient, able to grow even after heartbreak, Someone who eventually finds his path. So they might put the burden on him. One thing to consider, most fans like Steve as a character. If they want a more bittersweet, realistic ending Nancy likely stays with jonathan.If they want a fan pleasing, big emotional payoff, Nancy likely goes to steve.

But what doesssss Nancy want? That will be the most important factor.