How do I know if a guy is flirting with me?

I really like this guy, but hes got a girlfriend. Sometimes I think hes flirting with me. Does this mean he likes me? or:I really like this guy, but

I really like this guy, but he's got a girlfriend. Sometimes I think he's flirting with me. Does this mean he likes me?

or:I really like this guy, but he's got a girlfriend. Sometimes I think he's flirting with me. Does this mean he likes me?


or:I don't think this really means anything. I have a lot of close female friends, and people often think that I am flirting with them. However I am not interested in them that way at all. It is just how we interact. We are just being friendly.This may not mean anything.

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