What does spiritually married mean?

This guy basically ghosted me and he told me he wasn’t leaving his wife. He always told me he would. He told me they were spiritually married for many years but they got married recently at the courthouse. She pregnant with her first child right now. I met him through a mutual friend and she told me he was married. We still hung out and went on dates. Then he ghosted me afterwards.

What does spiritually married mean?
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