It is a exclamation expression. It denotes surprise, and that she wants to let everybody knows, she's admiring and flirting. It means something like... "Look! How handsome he is."
que linda means- how beautiful
Cousin, you are so handsome
Look at what I have look at what I have.
Look! What I...
Translation: What a handsome guy
spelled guapo = handsome sounds huapo
You are handsome and young
It means (what are you looking at)!
But from what city
But he/she to study
There's no reason