Best friend my butt.!!! 😡

I just found out that my best friend of 25 years has been split up with her husband for 5 months now.  I use to do everything with her and we have always been there for eachother through thick and thin.  Yea she moved 45 minutes away & we kind of lost contact for awhile, but she posted something on fb and I texted her and that is when she told me.  She thought I already knew 😔
I am so hurt, I have been the only friend that has supported her and her husband and now I just feel like I don't even know her anymore 😢