Is she insane? PLEASE HELP SERIOUS AND INTENSE?

so me and this girl were best freinds for awhile but then she met this other girl and they became best freinds they shortly after started dating and my freind slowly stopped talking to me now its at the point she sitches me everytime or dissapears for days,,but she keeps telling me shes just busy, but i know shes not that busy she just tries so hard to make me think shes still my freind and i love her so i want to think that but its just painfull atthis point...not to mention the other girl is a phsyco emo ***** who ***** with ppls heads. i loved this girl so much id do anything for her i decided id lay off, but last night i found out that the other girl is cheating on her or trying at least, she bluntly said she doesnt care bout the other girl, while i love my freind and all this is really taering me apart im almost ready to just kill myself.....my OTHER freind (the girl that the other girl was trying to get with) she still has all the chat logs i just dont know what to do im afraid if i show her she wont belive me think i edited it or something, please help what can i do? please dont say get over her cuz ill always love her idc if we cant be lovers i wish we could be freinds again tho i care too much about my freind to watch something like this happen please give me a hint this is hard