Second chance?

I'm pretty forgiving. I have a really long history with someone, even though I only knew her for half a year. We went through a lot.

They have contacted me again...

I'm not sure how to feel, or what to do. Should I tell them to fuck off? Should I talk it over with them? Should I reply at all?

What my mind keeps going back to is that it was the loss of a close friend, not a lover/Mistress. I do not want them back in that capacity, but we got along so well. It seems like such a shame to lose someone like that. She was one of the few people I could tell literally anything to. I don't expect it to go back to how it was, if I say I want to be friends again.

She contacted me to say sorry, and to explain what happened. She did not say that she wanted to see me again, but she said she won't even try to ask me something like that because she thinks I hate her guts. How strange, I thought she hated me all this time.

Do I want to be her friend again? Can I forgive her? After all the pain, and insecurity, and insanity, and lies I had to put up with?

The fact I don't know is very worrying...