Does a man's saying to his wife, "You are divorced," constitute a divorce if he intended another woman and did not intend to divorce his wife?

If you uttered the phrase of divorce in the context of speaking about your cousin's divorce, then your wife is not divorced by it; because it is a narration of divorce or an informing about it, and not an initiation of it. You must turn away from whispers (waswas) and not pay attention to them, because persistence in them leads to evil and tribulation.