I honestly thought Jason would be like a Bully, but neither he nor his group are like that, or at least we don't see Jason's group bully others, it was just the popular group.
Jason's mistake was that he didn't know what was happening to Chrissy, I don't understand how Jason didn't see something wrong with Chrissy. And yes, I know people hide their problems well, but he was her boyfriend, at least he had to see some strange behavior from Chrissy, but apparently Jason was focused only on him and basketball.
I don't think it's bad, I was just blinded by revenge and I wish he had found out the whole truth. (Jason had the power to persuade people).
Conclusion
I still don't like Jason but I don't hate him.
POV: ngl, I wanted Nancy to hit him,
I've never seen Nancy so angry