How do I back out without making her feel bad?

For the past week, I've been flirting with this woman I just met. I'm Trying to get over someone and thought this would be a good way to occupy my mind. She laughs at all my jokes and texts me all day. I've been texting her back all because its just a bit of fun. We've also exchanged pictures.

But as the days have been going on, she seems to be really liking me. She told me she gets nervous while she waits for me to respond, and she's not like that with anyone.

She's fun to talk to, and she laughs at everything I say. Which I like, who wouldn't! It's boosted my confidence. The first thing she said to me was she is not looking for anything, and won't trust any man. So I thought the terms of what we were doing were defined. I might have gone along with things she was saying wrongly and now it feels like she's getting more serious even though its only been a week!

Its not that I don't like her, but rather she's not who I want. We're Polar opposites, and apperence wise she's nothing like what I usually go for.

I need to back off, but I don't want to hurt her feelings. I also feel like a Piece of shit for letting it go this far.

What should I do?

How do I back out without making her feel bad?
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