Why would a guy try to maintain contact with a girl who called the things off with him?

I called the things off between us as our dymamics changed. We were together for 6 months. He was the first to remove my name from his contact list and i did the same. Now, every once in a while I get his text saying "hey" and when I reply I never get any answer back from him. What is he upto?
Why would a guy try to maintain contact with a girl who called the things off with him?
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