How to politely let someone down?

There's this lass who works opposite where i work, I'm at a garage and she's in a small shop, she's told me I'm attractive, followed my socials and knows I'm not looking for a relationship as I'm in a difficult situation at the minute. What makes it worse is that she has a boyfriend.

I've tried dropping subtle hints that I'm not interested and I'm not sure what i should say as i have to let her down gently seeming as i see her almost everyday, so question is how do i let her down gently without it being awkward or us falling out? Thanks

(Sorry for bad grammar I'm half asleep lol)
How to politely let someone down?
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