Having a bestfriend crisis!?

Well I have a friend... We used to be like sisters and we got into a misunderstanding a few weeks back. In those few weeks she got a new bestfriend. I've tried acting like I'm not jealus but on the inside I feel like telling her the truth. I have been trying to get along with her other friend but something inside me just doesnt accept her. I try talking to my friend but sometimes I'm afraid that I am annoying her. I miss our sleepovers and everything we used to do like talking about horses or going to the park every now and then. Sometimes I think she hates me and wen her bunny just recently passed, her other friend was the first one to know. What should I do? :(