Who is Tabitha from What Is the What and what is their importance?

Tabitha is Valentino's girlfriend. They fall in love at first sight. Because of the camp's strict codes of conduct, their relationship develops slowly. It is limited to secret meetings and hugs at basketball games.

Valentino is deeply in love with Tabitha, and yet, he believes that she is having other relationships while living in Seattle. While living in Seattle, Tabitha's ex-boyfriend murders her.