I don't. Guys just sort of assume because I'm nice to them and then they end up being wrong and it's awkward
YES! I'm the same way...
I'm not sure how it is that I do...I'm the same way with guy friends as I am with a guy I like as far as conversation wise. <br />
The guy makes the move ba<x>sed on whatever he is feeling and either I have to break it to him that I am only being nice and NOT flirting or go with the flow.
I'm might be extra nervous around him.
Look up videos on flirting and body language