Why can't you marry a woman who has been married before?

My cousin got remarried, married a woman with a daughter, before the wedding she said everything was good, that we would live a good life, that she would treat me well and I would treat her well, things were fine at first after we got married, but then it changed, she doesn't bring a penny of her salary home, she keeps it all for her daughter, saying it's saved for her to go to college someday,
My cousin said, what about the household expenses? She said, you have a salary,
My cousin said, my salary just covers the mortgage, utilities, and groceries, just enough,
She said, then figure it out yourself,
My cousin said, are you here to live or just to mooch?
She said, when I came, you didn't say you wanted me to support the family,
My cousin said, isn't it obvious? Your money is yours, my money is ours,
She said, don’t worry about my money,
Later, her ex-husband came to cause trouble once, saying, why are you involved in the child's affairs?
She sided with her ex-husband and spoke up for him,
My cousin said, who exactly is your family?
She didn't say anything,
My cousin told me, it's not that I don't want to live well, it's that you pour your heart out and they treat you like a thief guarding their treasure,
Do you all think women who remarry are all this calculating?