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The question is not whether the guest is dating someone; it's whether they socialize together. Do they attend events (like weddings) together? Do they jointly host when they are entertaining others?If they socialize as a couple, then they should be invited as a couple. If not, then inviting both halves is merely a courtesy.This has nothing to do with "defining the seriousness" of someone else's relationship for them; they are still defining the seriousness of the relationship by how they socialize.