Don't Cry For Me, Argentina

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What does it mean when someone says "Don't Cry For Me, Argentina" to you? This was preceded by "See you sometime in the future". When I said I didn't understand the reference, I was told I would get the joke if I'd seen the film (which I haven't). What joke? What was this person trying to tell me? It's someone who's very mixed-up and unhappy right now and I'm worried about them. Do they mean they won't be around for a while but they'll be back? It's the joke part that's confusing me more than anything, because they weren't in a joking mood at the time.