Why would he come back if he didn’t want to commit?

The guy is 42. We dated five years ago and he left me. He has been trying to come back over the years and I finally said okay let’s give it another chance. We had two arguments surrounding whether he was serious about me or had feelings and he says he never wants anything to do with me again and blocks me. Why would he come back just to leave me again so quickly?
Updates:
6 mo
We dated again for four months before the arguments
Why would he come back if he didn’t want to commit?
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