I see it as internal thoughts that no one would hear that one would think kinda thing, its like a really selfish way of being jealous because you just really want to be that special someone that only he pays attention to. To this extent is kinda wrong for the mc to think but again, internal thoughts one would only dare think ! I think he was mad more for people knowing he was nice though rather than just him.
I thought it was quite realistic, honestly. It's a visceral reaction when he's already feeling confused from the day before. Sometimes those thoughts aren't very kind, generous, or sympathetic. Sometimes they're selfish and hypocritical, and we hate ourselves for having them. It happens.
Anyway, Souta has had very rigid ideas of gender norms, which had been a consistent theme in the story. He even had a hard time processing that he was getting groped because "he's a guy though." And now someone more "fitting" for the role of the heroine comes in and does exactly what he wanted to do and he's feeling displaced. It's not the most reasonable feeling, no, and he realises that.
Sorry, I meant:
And now someone more "fitting" for the role of the heroine comes in, goes through what he went through, and does exactly what he wanted to do and he's feeling displaced. He can't even tell anyone about what happened to him, not just because of what the ML said, but also as shown in ch2 and ch5 when he's with friends, as a guy, he finds it hard to tell people he was assaulted. It doesn't "make sense" that it happened to him, he's not some pretty girl, etc.
the 2nd half of this chapter is sweet.. but I don't like the way the molestation issue was spoken about amongst the characters, or even how the mc felt a negative sort of way about him helping the girl. idk it's just kinda rlly odd to me