She reached out after all this time, but isn't saying sorry? What should I do?

Well, GaG. Looks like I will need all the help I can get on this one. I am honestly puzzled and unsure of what to do here. This is the second woman I used to know who has reached back out to me in the same year as another one, both of whom I guess still felt bad about how they acted and couldn't get it off their mind. But this one sends a text wishing me well blah blah blah and then saying it's okay if I don't want to respond.

Things fell apart with her a few years ago when she acted like a complete shithead and was not sorry for it and is still not saying sorry for it, she just wants to hear from me. I'm honestly unsure of what to say. I don't like situations where someone wants to speak to you out of the blue after so long and then just thinks everything should be swept under the rug. I am unsure of whether she really misses our friendship, is sorry for what she did, or is just looking back my way because she can't find anyone else.

I really welcome any advice you guys have.

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Thank you guys for the great answers.
She reached out after all this time, but isn't saying sorry? What should I do?
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