How should I respond to a vague and insincere text apology?
My ex-friend reached out to me after years of silence.
For context: my friend (f25, let’s call her Bonnie) and I (f27) haven’t spoken in years. We have a very complicated history (think manipulation and textbook narcissist). Our last encounter, she yelled at me for making one of our mutual friends uncomfortable when I confided in her about our bumpy relationship (My other friend was the one who asked me how things were. I can provide more context if needed). That friend was one of my best friends. Almost exactly a year later, my friend messaged me and asked me to recount how things had gone down, saying that Bonnie was telling her something different. My friend stopped talking to me after that, and I don’t even know what happened or what she thinks of me anymore. And that is just the last encounter of many, many years of things with Bonnie.
It’s been almost three years since then.
Today, she messaged me with an insincere and vague apology for “everything that's gone down between us in the past.” The way she ends the message is very close-ended, and it's not really a natural segue to start talking about the issues between us. I’m wondering what the best way for me to respond would be, if at all. I’d rather not, but because of the off-chance she’s actually being sincere, I wonder if I should. Wisdom please.
Thank you for putting in the effort to read all this, and please feel free to ask for any clarification or details I may have missed. I don't post often, so please be patient with me.