Typical trope incoming. It’s time for the MC to raise his hands in front of his body, wave them left and right, blush deeply, appear extremely shocked, and loudly deny that he is dating Suika.
Well, she's currently the best one. Though I have no idea what that "people not treating her like a girl" to thing comes from. There's no mistaking it. She's not even flat chested. So that idiotic and nonsense reason isn't there either.