how do i get over her?

Shes gonna ask me out again. While i really like her (maybe ive lost how much i love her), i think it may be best that we dont get back together. we've already been together twice before. but her feelings kept changing. and it messed me up so much (SH etc). i still like her a lot. and its gonna be real real real diffiuclt but idk how. im still gonna see her everyday at school etc etc