What do you do when you realize that someone is leading you on?

I've come to realize that a girl I know is leading me on. How do I stop things without making it awkward?
Updates:
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She made me think that she was into me, even presented me to her parents and for no reason she left me there with her family to go meet some guy. I found out later that she has been seeing him while we we've been dating(she doesn't know this).
+1 y
I also realized that she only makes an effort to talk to me when she is bored or has nothing going on in her life, which really p*sses me off so that's why I want to end things now.
What do you do when you realize that someone is leading you on?
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