How can I get a girl who likes me to lose interest? So I won't have reject her and make things awkward?

A girl that works at the front desk of my gym likes me but i'm not interested. How do I get her to lose interest without rejecting her and making things awkward every time I go? I have experiences with women i've rejected giving me a hard time at places I routinely go to because I rejected them. (Not bragging. But I'm an objectively handsome man with natural charm)

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Update: I'm looking for people who have the lifestyle of a socially ept, attractive person to answer. Not saying drop dead gorgeous but those who have experience and multiple options with multiple people romantically/sexually. ("Hoe phase" lifestyle)
How can I get a girl who likes me to lose interest? So I won't have reject her and make things awkward?
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