I hate my ex

So basically my ex is one of my closest friends. We dared for 6 months. She was my first relationship ever and I didn't even like her. I was jealous of her ex who I really liked (i thought i liked my friend) and I broke up with my friend on our 6 month aniversary and immediately told her that I liked her ex (me and the ex dated for 4 ish months and we're probably gonna get back together because we still love eachother). She acted like she was fine but i dont know if she was. Okay now onto why I hate her... shes an ahole and she keeps copying my other friend to 'be cool' i guess. It really pisses me off and shes also just a really annoying pick me and I keep her as a friend because if i don't, I'll lose two friends and I onky have four close friends. PLEASE tell me what I should do I'm tweaking bro