because Hanabi is a bitch but man, he is very stupid
According to this logic, the main character has negative IQ, given how long he stuck around her while being treated like he was.
Hanabi actually treated him semi-nice. Not exactly being stupid just because he can't see through her lies.
Also, I wonder if in the next chapter she will try to get back the MC? Seems like it is setting up for that.
And I bet we get the "eh", blank face from MC, and then glasses girl buts in with a "no, you can't!", and they get interrupted... This story really isn't breaking and tropes.