So, what i'm thinking about is, this guy actually likes the girl but he's extremely insecure. He's a very boring dude with zero muscles. He's worried that if they start going out, she'd leave him for ricardo. So he's trying to stay relevant. But he couldn't think straight and so blurted out whatever came to his mind.
On the other hand, the girl is actually an alien from planet 420 and she wants to capture this dude for research purposes. And the only way to capture a. Dude completely is to make them date you. So she's thinking she's doing a very good job. Moreover, she's not human so she doesn't really know how humans work. Thus she isn't at all questioning the situation