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I don't think you should give up just yet; give him a little more time to respond. If you don't hear from him in about a week, if you choose you can send a courtesy email kind of like a last chance email for him to respond. If he doesn't then I would say not to put any more time or effort until he responds. During that time, if you meet other people, you should be open to seeing where that goes and not close yourself off to those possibilities. May things could be happening for this guy preventing him from responding in a timely manner so giving him the benefit of the doubt before you wash your hands of the situation.
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