What does it mean when your boyfriend calls you his "wife"?

Anonymous
I've been dating my boyfriend for 3 months, but we know each other for a year now. We see each other every day. We talk about saving money, marriage, and how we see each other in our future, and all those conversations couples have. But recently my boyfriend's been calling me his wife, and telling me he wishes that me and him were already married, that he's the happiest guy on earth. what is he trying to get at?
What does it mean when your boyfriend calls you his "wife"?
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