Just found out my best friend was talking shit about my anxiety

I recently opened up to my friend about my irrational “what if” end of the world anxiety.

I feel heavily betrayed and disgusted as she’s cheated on numerous partners. I’ve helped her work through them and relieve her of guilt she didn’t deserve.

When I confronted her she said I was being over dramatic and need to keep my problems in my own life.

I need to drop her but don’t know how.