Why do i keep checking up on my ex?

[Turfwar]

I cut off my ex a year ago who i have no plans or desire to get back with . I just keep finding myself checking her twitter once in a blue moon to see if she's doing better or not. I think deep down i still hate her for what she did so i want to see her suffering. BTW i cut her off because we began dating again and she already had a boyfriend the whole time.i loved her for 3 years before then. I have a wonderful girlfriend who unfortunately i only get to see once a week. Who ive been with for two years now. That might be the problem. Idk. I just dont know why i keep checking up on her. Its been an ongoing problem. I know ive moved on i just for some reason wanna see her get played like she did me. Or just to plain see her doing badly