How do you handle a pretty girlfriend?

My girlfriend’s really pretty. But

i am not special in any way. How do you handle that? I ask because

My girlfriend could easily say there’s a trillion guys that would want To be with me. In a future argument and I’d be left speechless. It’s true and no one wants me.

Only way Is to become really successful / develop a good physique
Not so sure
Just break up with her (it’s mentally not good for me)
Other
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How do you handle a pretty girlfriend?
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