What should I say to this "after break up" message?

I broke up with my now ex girlfriend 2 days ago. It hurts so badly but we both knew it was a toxic relationship so we ended it on mutual terms. Yesterday she sends me this:

"there's some things I want to tell you too, you got the chance to think about things for a day and tell me yesterday I have some things I've been thinking about that I also need to tell you"

I understand she might need closure but having to talk to her again will kill me when I need to move on for my own sake. Whats the right thing to do? I'm having trouble being mean and rejecting her request but I also know I need to start thinking about my own health.
What should I say to this "after break up" message?
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