I lost my childhood best friend about 8 years ago?

i really don't understand she doesn't like me very much and she is change to me. w were best friends when we were in childhood and she was very kind and caring person but jealous person. She loved me as like sisters. Then years later, there was new boy in the school. all three of us were good friends and i left school but my ex best friend was still in school with him then another year later, this boy went to big school with me but my ex best friend went to different school. I heard that they fell out and hated each other very much but it was nothing to do with me between them.. she changed n she was two faced with me n i think she hated me very much. this boy n i becomed best friend n he was good helpful to me when i was bullied in school and i heard he fancied me and wanted us to together but i wanted to be friend with him bec i didn't really fancy him. Then he changed, won't talk to me at school then i had no ideas why he wont talk to me n ignored me n talked 2bully evil girl more than me n i asked him what wrong but he was grumpy n aguement with me and hates me. when i left big school and i heard my ex best friend and him become best friends and they hate me a lot and they always talk behind my back. they hate me for nothing reasons but i haven't do something wrong with them. i think they are jealous of me because of my look and personilty. but i would like to move on and i want to try to back friend with them but it is hard for me because i don't trust them anymore and in case, it will be more trouble between me and them. i know they are sly and two faced. i miss my ex best friend. i don't understand how they got back to best friends again and hate me for nothing. i am thinking of her all the time and miss her a lot because she was my ex my best friend. why they done to me?