A few months ago a friend and I had a falling out. It's been over 6 months since I've seen them but I still feel bad about what happened. I sent them a text the other day just for some closure and to apologize. They responded a weekish later being incredibly hurtful and accusatory.  They didn't accept my apology or apologize themselves at all. On one hand I want to take the high road for myself and also not get more texts belittling and bashing me. But part of wants to text back and defend myself because the things they said weren't true and were just hurtful for the sake of being hurtful.  Would I be an asshole if I texted back in my own defense? Or should I let it go?