AITA for breaking up with my gf

So m 21 f 21 we were in a relationship for past 2 years and she used to stalk her ex. And when i confronted her she promised me to never do it again . But still she kept on doing this. And she was like pics hi to dekh rhi hu isme bura kya he and i was like ab meri bhi ese hi dekhio and i decided to break up with her. Edit : so its been like 24 hours and i have recieved literally 178 calls from her. I really dont know what to do.