What is the ruling regarding a man saying to his wife, "What is between us is over," intending divorce, but without the intention of actually divorcing her immediately or in the future?

This phrase is a kinayah (allusion or euphemism) that could imply divorce or something else. Divorce does not occur through kinayah without the intention of causing it. Therefore, if the man did not intend to effect a divorce with this phrase, no divorce has occurred.