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Why would you marry a man who would treat his child like this? Do you think he'll be more caring to the kids he makes with you? Or to you, his wife?
Advice for you: get away from these dysfunctional people and grow up a bit.
If I had any advice for the poor teenager, I guess it would be the same. At least she has biological immaturity as an excuse. (and I hope no one's waiting around for the father to grow up.)