My ex suddenly reappeared in my life and I don't exactly know what she wants now. What should I do? ?

Our breakup was bad, it ended as a fight. But I haven't completely got over her. I tried my best to forget about her, and just when I thought I did, she comes and talks to me again. Does she want to make up? Or does she just want to repair our friendship? Or try our relationship again? I don’t know how to act around her. What should I do if she asks me to get back together?