Swearing not to live in Portugal and wishing to do

Q: I traveled to Portugal on 11 August, 1989, with a Muslim brother to work there with him, as he had business there. He then left me and traveled to Spain, with the intention of returning on 5 September. He did not return at the appointed time, and I became worried about him, fearing that he had faced troubles. So I vowed to Allah (Glorified and Exalted be He) that I would leave Portugal by 11 January, 1990, at the latest, if my brother returned safely. During that time I could earn a good amount of money to start my life with in Egypt, so there would be no need for me to stay longer in a country like this. My friend had planned to stay in Portugal until we were able to get residency. I said, after my stay in Portugal became suffocating for me, that the sign of the acceptance of my vow and its winning the Good Pleasure of Allah (Glorified and Exalted be He) would be my feeling of relief, the vanishing of my worries and unhappiness, and the return of my brother. (Part No. 23; Page No. 103) And all this happened, because, after this vow, Allah (Glorified and Exalted be He) made me feel relieved and returned my brother on the same day. However, when he returned, he kept talking to me about his ambitions, and his plans of staying for years in Portugal with me, and the hopes he had pinned on me staying with him regarding his business. This made me feel that I should be honest with him and inform him of my vow not to stay in Portugal for long, hoping that he would agree to come back with me after spending the time needed to earn the money that would cover the travel expenses and the remainder would be enough to start a new business with him in Egypt. Accordingly, I would attain benefit and make a profit, and then could return to my family and friends and the congregational Salah (Prayer). After I told him my plans, he did not agree with me. He even told me that what I had said was Satan’s work in order to spoil my journey and the goal behind it and make me return to Egypt, where there is unemployment; and it is true that I did not find a job after I received my BSc in Commerce in 1985. He asked if I would return if I had not made good money during this time, and l said that I would as I had made a vow to Allah to do so. Despite this, he is still talking to me about his projects and ambitions and the years that we should spend here together, and he is asking me to forget completely about the idea of returning.Is it true that, as he said, Satan could be persuading me to return and should I believe him? Or would my vowed return earn me the Good Pleasure of Allah (Glorified and Exalted be He)? (Part No. 23; Page No. 104) When I made this vow to Allah, a voice inside me warned me that the time would come and I would find my money had begun to grow and my life had begun to run smoothly, but I silenced it saying that I would not, In sha’a-Allah (if Allah wills).I ask Allah to forgive me, my father, and you and give us well-being, and make your Fatwa (legal opinion by a qualified Muslim scholar) help me attain the Pleasure of Allah (Glorified and Exalted be He). May peace and blessings of Allah be upon Muhammad, his family and Companions!