What does a guy mean when he says we hit it off great but he's not ready for a relationship?

This guy and I have liked each other for some time. Years. He said we hit it off great but he wasn't ready for a relationship. He said it wasn't due to his divorce. He said he needed to work on himself and change his ways.

What does a guy mean when he says we hit it off great but he's not ready for a relationship?
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