How do you get out of a bad relationship.

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I have been with my finacee for over two years now, and we have an 8 month old daughter. In the beginning, all was well, but when I became pregnant with my daughter, he took a dive off the deep end. I don't really have anywhere to go, and am still secretly putting money aside for an apartment. Does anyone else that has been through this have any suggestions on how to cool someone down? I've tried everything; I walk away, and ignore it, I keep calm and collected, and I try my best to stay out of his way. But, it seems that the harder I try to end the fight before it gets out of hand, the angrier he gets. Am I missing something? Or doing something wrong?