The most brutal way I've ever seen someone handle this was 'Oh, you have a girlfriend. Are you going to get married?'  'I, uh, don't know--' 'Well, do you love her?' '...' 'Anyway, what were you saying about the movie?'

"We Get It", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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The most brutal way I've ever seen someone handle this was 'Oh, you have a girlfriend. Are you going to get married?' 'I, uh, don't know--' 'Well, do you love her?' '...' 'Anyway, what were you saying about the movie?'