Responses
Brett's tactics right now with Hayden would have worked on him 2 years ago. But they don't work on a Hayden that has spent 2 years miserable, trying to move on.
This is my theory based on what he says later and it fits with Hayden saying that he feels like he's always filming the wrong scene.
It's not fair from Brett's perspective because he didn't get a chance to try - 2 years ago hime didn't want a relationship. But from Hayden's perspective giving your heart to a guy who broke it a second time is a stupid move.
Looking at the raws....
Hayden isn't trying to teach Brett a lesson. He was really vulnerable with Brett before and gave Brett his heart and Brett broke it. It isn't fair to Brett because Brett didn't ask for that. But Hayden isn't interested in "getting back together". He isn't interested in rehashing a relationship that ended in such pain for him. It's not an intellectual reaction or reason, it's purely emotional. Which is a really nice bit of characterization. He's emotionally driven. He got burned and he doesn't want to put his hand back on the stove.
It's not about fairness. I am not sure it's honest. He's not the optimistic trusting kid he was at the beginning with Brett. He's afraid of relationships and the pain they bring