It's actually really important to me that one of Sayaka's breaking points was her overhearing men being sexist and gross before absolutely losing it. Because it further emphasizes that Sayaka's main tragedy is not a boy not falling in love with her.
I think you can start applying this to Sayaka's character from when Mami first warns her to be cautious. What Mami tells her about think of why she's making her wish, I think it still applies, but not as her wanting Kyosuke to love her. I think Sayaka wanted to do good for others, but at the end of the day she wanted something out of that, primarily justice, change, a chance to make things better.
Her main tragedy is trying her absolute best to care for people, to be righteous, to use the powers given to her, to carve a better world; but to be given nothing in return. No reward, no foreseeable better future. Just suffering. And her eyes open to the suffering of others just for her to not be able to do anything about. Again and again and again.
And she tries to do this selflessly, like Mami indirectly told her to. To be fine with her efforts not being recognized, to be fine with people finding happiness without her, to be fine with people not respecting her right to make her own decisions. But at the end of the day that doesn't work and it tears her apart.
She wants to do something for the world, and risks her life to do it, the only thing she gets in return is her bodily autonomy being taken away. She's turned into a husk of a soldier without fully knowing what's going on. She's not even the best soldier (like her best friend could be), an average one. And she still tries to use that to keep fighting, because it has to be for a reason. It has to mean something. Because she's essentially given up everything, it has to mean something. It has to help her reach her goals in some way. Right?
It's not just a messed up way to cage her in a system that forces her to add onto the injustice she's fighting against. Right? Right?
(Maybe she calls herself stupid because she thinks she's stupid for trying to change things, for believing that things are capable of change)








