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You're getting massive social proof from the girl who adores you brother.
I say, make the other girls, who are incidentally hotter, chase you some more. Say things like: "I'm loyal and faithful to x. She cooks the best meals, gives the greatest blowjob, super awesome in bed..." And so on. Tell all these girls who are hitting on you how great she is and that you're very loyal and faithful to her.
This will drive the hotter girls crazy and will want you more. They will literally be begging to sleepover your place and seduce you. However, don't be an easy kill for the girl who adores you or the even hotter girls.
With this strategy, the girl who adores you will adore you more since other girls want you and she'll know that you're saying good things about her. You'll have sex on the side with the even hotter girls and it will be okay with them if you have multiple long term sexual relationships. Just be honest and be sure that you can handle this kind of situation.
Yet at the end of it all, stick with the one who adores you. She will forgive you. She will feel great once she knows that so many girls want you who are hotter than her and yet she is the WINNER when it came to you.
It's a happy problem brother. All men should experience this kind of situation at least once in their lives.

Awesome advice.
Also: if your girl (whom I agree you should NOT dump) can be improved lookswise, for example by losing weight, I would try to think of some ways to encourage this. American white girl are super sensitive about weight so I would NOT neg her about it. I've tried 'leading by example' - talk about my healthy eating habits and exercise regimen, which doubles as a DHV, and invite her hiking or to the gym with you - which seems to work well. Even if she figures out what you're doing, she likely won't call you out on it, because that would be more embarrassing for her than for you.
Weight loss is a slow process though, so this is only LTR advice. But it sounds like you have and want her for a LTR.
If it's still like her dress, how she does her hair, etc. that you can probably neg her on (or do jealousy ploys by casually pointing out example of stuff you see ' - hey see her hair, yours would look cool that way' etc.)
If it's immutable stuff like facial structure and breast size..oh well.