Do i have every right to hate her now?

I know exactly how you feel. My bff stole my bf and I was so furious with her. In the end I forgave him, cuz he didn't sleep with her and its a very long story. Anyway you have ever right to hate them, don't let anyone tell you differently. To move on, just take it one day at a time. Vent to another friend if you need to and keep your mind occupied with school or work or something else.