Why is the Rival constantly bullying the Prodigy? And why is the Girl compelled to protect him?

[Girl]
Why do you torment him?
Are you jealous?
There must be a reason
You're so cruel
What have you got against him?
Does he scare you?
What did he ever do to you?

[Rival]
Oh no, I can't believe
You're falling for this loser
Oh no, I thought you knew
That I am so much cooler

[Girl]
Why do you despise him?
Are you frightened?
Are you being driven
By your pride?
I think you feel threatened
By his brilliance
But still you admire him
Deep inside
[Rival]
Oh no, I can't believe
You're falling for this loser
Oh no, I thought you knew
That I am so much cooler
Oh no, I always thought
That we should be together
Oh no, I really think
That you can do so much better