uhh, why are you even having to think about this? you'll hate yourself if you don't take the new job, you need to get the fuck out of dodge.

I can only assume that you're posting this because you're going to take the job anyway but you want people to tell you that you're not being a heinous bitch first. you have my expressed permission to be a dick and leave the school scrambling to find a substitute. they have five days, my school has had to do the same thing in much less time than that. they'll be fine.