This is one of the real problems with being an independent contractor: the independent part is great, but the contractor part can pose some problems. Many independent contractors experience exactly what you are going through, and that is why you should pursue several projects simultaneously.
It is possible that your prospect is stringing you along, but frankly, if he is not interested in working with you, it would be easier for him to say so. You should stay in touch and continue to let the prospect see the value that your services add, while focusing on the prospect's needs and the ways that your services will meet them. All of your contact with the prospect should conclude with a commitment from him, such as for a future meeting or decisions by a certain date.
At the same time, consider the following questions: are you actually dealing with the decision maker, and, secondly, is this company truly looking for what you offer and can they pay for it? If the answer to each of these questions is "yes," then your "yes" should be coming, hopefully soon.
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