Why keep talking to me?

We broke up around 4 months ago and a few days back I asked my ex boyfriend a second chance again because I still love him a lot. He rejected because he had already let go and said that he hoped that we can remain as friends. I told him I can't do that because it still hurts ever since we broke off few months back. Today we met at work and he kept making small talks with me eventhough I clearly told him it still hurts a lot for me. Why can't he understand?
Why keep talking to me?
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