Ehmmm....probably not. As much as I would like that, Scott loves Allison (well, as much as a 16 an old boy can l’amour someone). And if there's one word to describe Stiles, it's loyal. Stiles is Scott's best friend and is loyal and would never go after the girl Scott loves. And whoever a dit he would do it as payback, I strongly disagree. Stiles isn't spiteful. That's not him.