Why would she do this?

So I’m confused. I met this cashier, and she went out of her way asking my name, always trying to be the one to cash me out, she even gave me a little book sprayed with her perfume with a single quote saying, “Just because it’s taking time, doesn’t meant it isn’t happening.”

Anyways, I was posting questions about her previously trying to find out how to approach her for a relationship. Instead, she added me. She said she was the same age as me, I was watching LOTR while she was coincidentally watching The Hobbit. She even offered to paint me a photo to help decorate my place.

I thought she liked me, and you might’ve thought so too. Unfortunately she ended up posting her boyfriend, sharing how much she loved him. I’ve been through this 6 other times (in a row) prior, and at this point, I’m just wondering why did she like… lead me on, if she’s happily taken? I’m so… confused.
Why would she do this?
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