What does it mean when you ex doesn't return your stuff after breaking up with you?

I was in a relationship with a wonderful woman for the past two years. It was almost magical and we got along famously. Then, without any real warning, she decided to end the relationship in January. Since that time, she has completely cut me off- doesn't talk or respond to emails/texts. She even avoids me when she has to come around my work place. I have conveyed to her via email that if she is truly intent on ending the relationship, then I would like her to return a number of my things which she still has in her possession (note- these things are not/were not gifts. they are items that I need for my work). She has not returned the items and it has been several weeks since I asked for them back. What does her behavior mean? Why is she holding on to my things? I am not sure how to interpret her behavior.
What does it mean when you ex doesn't return your stuff after breaking up with you?
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