Should people in a relationship not be insecure?

If the relationship is good should people stop being insecure? Stop worrying about what they look like or if they good enough or what other people think?

I personally think it's the best part of a relationship. To feel comfortable with yourself and knowing your partner loves you as you are. But so many people are still looking for external validation outside themselves and partner. "Do I look pretty?" "Am I too fat?" "Too small" "am I good in bed?"

Shouldn't these questions only matter between yourself and partner?

Should people in a relationship not be insecure?
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