Friends

Me and my best friend had a massive fight about 3 months ago. It kinda all good now and we have moved on but I miss her so much. We both split and are sitting in different groups, she has became close with this girl and I know we aren't best friends anyone but I feel replaced and I wish that was me. What do I do? I miss her so much and want to be best friends again but I don't think she does! She has a new one!!!! we still talk and are friends still just not as close as we use too.