Why my ex girlfriend just up and walked away from our relationship and lye to me about needing to find herself and end up with an abusive old friend?

Our 5 year relationship was good so I thought, never really had a real fight as a couple.

We were always happy sexually, seemed like the best girlfriend ever.

And now she won't even acknowledge that I ever existed no texts no phone calls, and when he sees me in public wants go attack me physically "WTF"

I am so lost without my best friend now, and hearing stories about him abusing her mentally and physically I don't get it.

Updates
+1 y
I Have moved on to my new quest for a new girlfriend, I'm searching for why she would want to be this idiot
Why my ex girlfriend just up and walked away from our relationship and lye to me about needing to find herself and end up with an abusive old friend?
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