Ex's friends re-friended me on Facebook. what does this mean?

My ex and I broke up a year ago. I deleted him and his friends on Facebook to help me move on. A couple months ago one of his friends re-friended me. My ex and I dated long distance, but now I got a job in his city and he heard through people. Now his best friend added me on Facebook again two days ago. What does this mean?
Updates:
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I'm sorry, two separate friends have added me on Facebook. The second did after word spread that I'm moving to where my ex lives.
Ex's friends re-friended me on Facebook. what does this mean?
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