Well, if a person who dating someone really feels they could do better, for whatever reason, they're entitled to end the relationship. I mean, why stick around if someone isn't what you would consider equal/or makes you feel good?
However, you're right that there can be a shallow note to it; only that's generally when it's coming from other people. Of course, there are the voices of genuine concern when a person is in a poor relationship (abusive or simply dating someone who's somehow taking advantage/using their partner) but most of the time it's coming from nosy brats who feel like you're better-looking/smarter/funnier/cooler/richer/more awesome than your partner, and thus, "YOU COULD DO SO MUCH BETTER! WHO CARES IF THEY'RE FULFILLING YOU'RE EMOTIONAL NEEDS AND YOU LOVE THEM. DATE SOMEONE HOTTER!"
You see it a lot with celebrity couples and fictional couples. That's mostly because there's a WHOLE LOT of projecting going on.
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However, you're right that there can be a shallow note to it; only that's generally when it's coming from other people. Of course, there are the voices of genuine concern when a person is in a poor relationship (abusive or simply dating someone who's somehow taking advantage/using their partner) but most of the time it's coming from nosy brats who feel like you're better-looking/smarter/funnier/cooler/richer/more awesome than your partner, and thus, "YOU COULD DO SO MUCH BETTER! WHO CARES IF THEY'RE FULFILLING YOU'RE EMOTIONAL NEEDS AND YOU LOVE THEM. DATE SOMEONE HOTTER!"
You see it a lot with celebrity couples and fictional couples. That's mostly because there's a WHOLE LOT of projecting going on.