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"Honey, I love that we're sipping tea in Milan... I just wish you weren't such a fatty. Ciao!"
I don’t think that this is unpopular as long as you aren’t making fun of your partner. You can break up with someone for whatever reason that you want. As long as you hold yourself to the same standard then I don’t think you’re an asshole although I wouldn’t leave a serious partner for any of these reasons.