Not to crush on a person that's attractive

How do I not start crushing on a person in the same school I'm at?
They're very attractive and we've talked like once or twice last year, I don't think they even remember me...That's why I'm going to call it infatuation cause it's mostly their looks that I'm attracted to. We're not in the same class and I don't think they'd approach me since we only have two things in common which is watching a certain anime and being the same age....

I really want tips for how not to start crushing on them again I really can't afford the mental toll it'll take on me, and neither the mental gymnastics I have to do for me to explain why looking for them wherever I go and trying to grab their attention is definitely me not liking them ignoring the obvious answer and the nice feeling I used to get when thinking of them. Sorry I wrote alot and possibly even rambled because I can't tell anyone any of this.