@Eliminateur
I think you're missing the point that Chiba is a horrible person. He doesn't really love Haru. He's a narcissist that only loves himself. Now he's in a position higher than Haru so he wants to turn her into his slave. He's delusional to the core. If it's not obvious yet, don't worry, it's gonna be more clear later on.
As for Haru, she is a more realistic girl than your usual anime girl. She's not gonna fall in love with just anyone like your run-of-the-mill anime moe blob. But you know, even if Chiba wasn't a gross otaku but a total hottie, she still would not date him because she knows he's a horrible person on the inside.