He was a cat who had fallen in love with a human. It wasn't something that he'd planned. It had just happened. Now he was devoting all his energies into making her love him back. Nevermind the fact that she was a teenaged girl who had a crush on an actual boy. He knew that, and other things because she told him everything under the belief that he was just a cat and didn't understand anything anyway. But he understands more than she thinks he does. Now his only challenge is making her fall for him. That's a challenge he's ready to accept.