How do I know if a guy is flirting for fun or flirting with intent?

Anonymous
I am interested in a guy and we've been flirting for quite some time. He shows all the signs of a guy who has interest. So there seems to be an attraction between us. He has started to accidentally brush against me and stand in my personal space in the last two months in addition to his friendliness and attention he gives me. How can I tell if flirting is all fun for him or whether he has intent to pursue further without asking him directly?
How do I know if a guy is flirting for fun or flirting with intent?
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