How to flirt without leading them on?

I'm flirty I guess I just like to have a good time. I don't know if that's good or bad but my flirtation comes from being too nice and friendly. Anyway, this situation has been happening to me lately where I playfully tease or flirt back with certain guys, and end up being asked out. They call me cute/pretty and compliment me, and ask me personal questions, and all that stuff, but when I nicely tell them no, they give me the cold shoulder like I purposely led them on and now I'm a jerk for rejecting them but they eventually go back to being cool. Everything I do and/or say is unintentionally... So how do I change my ways? I don't want to lead on any guy!
How to flirt without leading them on?
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