My stepfather raised me. After my wife got pregnant, his son gave me 100,000 yuan, and my marriage came to an end.

(From a reader submission; images in this article are from the internet)
My stepfather raised me. My wife got pregnant, his son gave me 100,000 yuan, and my marriage came to an end.
How I choose to get along with my own family is my business, and has nothing to do with my wife, but she did not see it that way. After she learned that I had made some sacrifices for my family back then, she always found ways to demand compensation and returns from them, acting everywhere as if she were the wife of their benefactor. But what she did not know was that they had also done me a kindness, one I could never repay in this lifetime. Because after my mother died back then, it was my stepfather who raised me. And right after my wife got pregnant and my stepfather's son gave me 100,000 yuan, my marriage also came to an end.
I lost my father when I was very young. After that, my mother raised me alone for more than three years and endured a great deal of hardship. Later she met my stepfather, and ever since he married my mother, he treated me as his own child, and I also had a good relationship with his son. At first, after my stepfather came into my life, the four of us lived happily as a family, but the good times did not last. Later my mother died, and at the time everyone thought my fate would become very bleak from then on. If my stepfather had taken his own son and left me behind, I would have become an orphan with no parents and no siblings.
But unexpectedly, my stepfather was as good to me as ever. He lived with his own son, who was two years older than me, that is, my brother with whom I had no blood relation, and worked hard to raise the two of us. I was very grateful. At that time the family was not well off. Since my brother's grades were better than mine, I did not want to put the family in a difficult position. And when I thought about it, even if I kept going, it would just waste the family's money, so in my first year of high school I voluntarily dropped out and went out to work to support the family. Thanks to my efforts, my brother was later able to get into university smoothly, and after that, through his own hard work, he became a winner in life. Because of this, he and my stepfather always felt they owed me, were grateful, and always wanted to find a chance to repay me.
I have been married for more than two years. My wife's family is the petty urban type, a bit vain, but I was grateful that she married me despite her family's opposition, so I always put up with it. Because at the time, her family thought I had no money and looked down on me. After she got pregnant, my brother rushed over. Over the years he had made money in business, and because he felt very guilty about the sacrifice I made back then, he immediately gave me and my wife 100,000 yuan on the spot so she could build up her health. Only then did my wife learn what had happened back then. She laughed and said she had never expected our family to have a ready-made money tree, and so she always complained that I was foolish and did not know how to enjoy my good fortune. She often asked my brother for money under all kinds of pretexts, and for my sake, my brother satisfied her every time.
But seeing how my wife made ever-increasing demands on my stepfather and brother, never satisfied, and looked down on others while posing as their benefactor, I felt her behavior was very ugly. Everything I did back then was voluntary, and I did not want any repayment. Besides, if not for my stepfather, my life now might have been even worse. I feel my family does not owe me anything, let alone owe my wife anything. I am determined that things cannot go on like this, but no matter how I talked to her, she refused to restrain herself, so I decided to divorce her. Do you all think I did wrong?