A True Friend Wouldn't Do that!

Ok so this past year me, my best friend and my other friend were like the best friends ever. We pretty much would do almost everything together. Well we have been friends for a while but we just gotton closer well ever since school started the begining of the year it was all good. Until one day she sat somewhere else. So we were like ok thats cool since she does have other friends to hang with except she's been doing it for a while so we both finally went up to her and asked her if anything was wrong or what was up. She said I didn't acted like I belonged or ya didn't eaither and we were like what we never did anything like that. Well then she just went back to her old ways so we and still are praying for her. It just got worse because she was telling us how come your not my friend anymore and the thing is we never stopped but she talked it like we did. So we just went on our ways but we still talk some but not as much. So now what makes me mad is that now she's going with my friend's brother just so they could be friends again or whatever and then she asked my friend what she thought of them going out so she told her in a nice way what she was thinking of doing. Well me and my friend was talking and she told me that she cant be real good of friends we used to be because everytime she would say something to us like it was our fault and we both don't want to be around all that since we are seniors and that when we get together there seems to be drama or whatever. But I've decided for myself is to just don't get into it with her or nothing and if I see her I'll just say hey but I mean a real and true friend wouldn't do this.