Flirting

If my friend doesn't flirt back does this mean he doesn't like me?

I think I have feelings for one of my friends (a 'casual' friend, we're not best friends), and I'm trying to work out what to do. I always find myself wanting to talk to him and get physically closer, and sometimes I get a little jealous when he has long conversations with other girls. Also a couple of times when I was with him and slightly tipsy, I was flirting with him unintentionally (as in, I wasn't really making a conscious choice to do so, and I am not the type of girl who flirts with anyone when I've had a drink). So I do think I like him. Secondly, I am trying to work out if there is any chance that he could like me, or that he hasn't even considered the possibility. I have flirted with him (sitting close so our legs were touching, lots of eye contact, hand on his arm etc), and while he has never moved away from contact or seemed uncomfortable, he hasn't initiated anything like this himself. I mean obviously he spends time with me and smiles/laughs around me but we're friends so this is normal. I wouldn't describe him as a shy guy, but he's not incredibly outgoing either. So the way I see it, there are 3 different views on the situation. 1: He recognises my flirting, but only likes me as a friend, so doesn't reciprocate; 2: he's unaware I am flirting with him, because he thinks I'm just being his friend, or 3: he likes me but doesn't know how to react/doesn't want to do anything to jeopardise our friendship I think he's mature enough so that if I was honest with him and he didn't feel the same way, he wouldn't act weirdly around me, so I'm not too worried about messing up our friendship. But I would prefer to save myself the embarrassment if he is not interested.
If my friend doesn't flirt back does this mean he doesn't like me?
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