Ghosting a Best Friend

Kathleen has been ghosting me for two months nothing happened if you ask her she replies that's the way i am but i do feel extremely hurt. She actively ignores me and keeps posting stories on instagram while she ignores me I'm losing my mind it seems like she really does it on purpose she'll probably show up in a few weeks with a text like sorry honey  i don't remember to reply always or some bullshit like that. It pains me too much to lose her as a friend what should i do? "I can't think of ending this 10 year friendship that i consider sacred in my life although i seem to be the only one who thinks it is"