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I understand your situation. The best thing to do is to go to the local Foreigners' Office, or in case one is absent, to the local police station, and get a 'renewal of short-term visa'. Luckily, this can be obtained within Spain, on the basis of proof of your income / means of subsistence, and reason for staying (family reasons). However, this will not work indefinitely. In the next step, you should marry your fiancee. This will give you the possibility to apply for residence and a Foreigner Identity Card in Spain, and after one year, the right to apply for Spanish citizenship through residence (which is much easier than through naturalization, basically you need to be over 18, not separated from her, and be sufficiently integrated in Spanish society, i.e. being member of a club or two and having some form of income, even from abroad) at the local Civil Registry. Once you are a citizen, you may remain in the country indefinitely.
I hope my answer was helpful and look forward to your rating, which is essential to my activity.
Dr I L Vlad