I'm In Love With Stacy's Brother

I've been hanging out with Stacy
Everybody thinks we're dating
Cause' I spend my weekends hanging at her house

She's a part of the cheer team
Top of her class and she's prom queen
When we study chemistry

She unbuttons her blouse
But I got a secret I must confess
It's not her laugh or the way she'd dress
She's not the reason I've been thinking of love

Every weekend when we hangout
I lose my cool when he's around
And I don't know if this is just a crush

How do I find
The words to tell her?
I'm in love with Stacy's brother