Why does my friend make excuses for someone who did me wrong?

Anonymous

My ex-friend, A, got with my boyfriend straight after we broke up. I'm pretty sure A was texting him during our relationship as well and so we are no longer friends. She betrayed me.

I have a mutual friend with A who is my close friend but they are not that close. She has asked me why we are no longer friends and I told her why. After I told her that A got with my boyfriend she kept making excuses for my A and the betrayal and saying she still loves her even after she backstabbed me. Is the mutual friend really my friend? Am I being unreasonable in wishing my friend had my back in this?

Why does my friend make excuses for someone who did me wrong?
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