Staying with your girlfriend without a marriage contract is an illegal and immoral act in Qatar. If you are not caught as some members posted you are lucky. You might be able to stay for long if you are not caught and if somebody see you and catch you that is the end for both of you in Qatar. If you are not interested to marry your girlfriend why you are staying together? If you are still interested to illegal and immoral activities, then keep quite and dont publish things like that in a public forum which might bring you trouble.