What can I do about anxiety over my boyfriend leaving me in the future due to not fitting the normal standard for beauty?

Well my boyfriend does fit the standard, he’s perfect and I notice girls giving him attention. But I’m not the normal standard for beauty, I’m Asian and also flat. Right now he loves me because he lives and works with Asians. But I have a feeling he won’t like me anymore and expectations will change when he works in a different environment. I know I shouldn’t be ashamed but sometimes I wonder

What can I do about anxiety over my boyfriend leaving me in the future due to not fitting the normal standard for beauty?
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