Promise to marry broken due to these reasons - acceptable or not?

I was asked for my hand in marriage by a brother a year ago. His condition was that I move to the city where he was staying. I planned on moving there recently so we can marry and was told by the brother that he cannot marry me anymore. He did not give a reason for this. I spoke to his brother who told me that he felt that he cannot give me the life I deserve and does not want me to give up my good job to move to where he lives since if I get a job in his city it will not be as good as the one I have now. He does care about me. I have developed feelings for this man and I feel that I would rather marry him than keep my good job. Were his reasons for breaking his promise to marry me valid?