How does the author describe Yitzchak, and how does the reader know that Yitzchak likes Gitl?

From the text:

Gitl describes Yitzchak as a monster.

"Yitzchak the butcher is a monster. All he wants is a nurse for his children."

We know that Yitzchak is interested in Gitl because he has proposed marriage.

"If you would accept Yitzchak the butcher's offer, you could be married, and living in a fine new house in the center of the shtetl," Shmuel said.