<human>: Can you provide a brief overview of the text?

Ex texted me yesterday (we dated for 5 years) wishing me a Merry Christmas. Stirred up emotions, obviously. I texted back saying thanks. She asked me how work was. Told her things were fine, and that I would be traveling to Italy with a friend for New Year's. For some reason this kind of upset her and she stopped trying to converse with me.

Somehow the topic came up and she was upset that I defriended her on Facebook (she broke up with me.) I told her it wasn't easy to do but something I had to in order to heal. The rest of the conversation were few word answers from her, so I let her go.

How do I go about handling this? Why would she want us to be Facebook friends? I feel like I was making progress "moving on" and now this kind of set me back.
<bot>: Ex texted me 2 months after breakup, seemed excited and happy to talk to me at first, conversation quickly turned sour when she brought up that she was upset I defriended her on Facebook.