He calls me his "sister" ...is he not interested at all?

I met a guy that I thought was attractive, but I was dating someone else at the time so we didn't talk that much at first. I recently broke up with the guy I was with, and he had met him before. One night we met up for drinks and he started telling me all about himself and we found ourselves clicking a lot, so he started calling me his "sister," and I call him my "brother" as well. We talk nearly every day, but he tells me all about his flirtations and all the girls he's interested in (and vice versa). He's a sweet guy and takes care of me a lot, and at parties he does engage in a few flirty touches(hand on knee, arm around me) sometimes. I'm starting to feel attracted to him but does he just think of me as a new female friend (he told me he had several close female friends in the past) or could he also be somewhat interested? I sometimes try to test the waters, but he keeps asking me to set him up with someone and how he wants a girlfriend. Am I stuck in this best friend zone?
He calls me his "sister" ...is he not interested at all?
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