How do i get my girlfriend infatuated with me?

alright, well im pretty sure my girlfriend is a succubus...if you don't know what that is look it up. shes incredibly hot but she says really hurtful things to me and i think Satan possesses her soul. So, how to get her to be not evil for a little while at least? that may sound cruel but compared to her, this is a drop in the bucket..shes hard to approach sometimes....most of the time... and i think shes cheating on me anyway so basically i just need ideas on how to do this.