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Important to remember 1 interviewers opinion is only that. The final executive admissions committee gets to vote while looking at the whole picture.I feel your pain, friend. The decisions that are made behind closed doors that separate an outright acceptance from a WL are arguably the most mystifying part of the entire application process - it's particularly frustrating when you hear such positive feedback from your interviewer (I was under the impression the the interview here carries a lot of weight in the final decision process but who knows how Georgetown actually operates).
Happy to chat in PMs if you need to vent or just someone to sympathize with - hang in there.