So we had a disagreement and he said I broke up with him. but we never established we were in a relationship?

So we have went on plenty of dates , our children have met in the first week , I have spent the night. We have kissed on the lips but just pecks and on the cheeks. We just slept in the bed together the last time I stayed the night. Does he think we were automatically in a relationship or should I had considered it a relationship? He just confused me honestly
So we had a disagreement and he said I broke up with him. but we never established we were in a relationship?
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