Is this a fair enough reason to breakup with her now?

She’s such a nice girl and pretty and we get along. It was lovely how we met.

It’s bad but her sister is just mesmerisingly stunning. Like I can’t take my eyes off her. She’s tall and dark hair and just wow. I can’t be with her thinking about her sister like that.
I wish we could switch
Yeah u gotta breakup
No don’t
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Is this a fair enough reason to breakup with her now?
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