How do you know when to call it quits?

My boyfriend of 9 months, was really nice in the beginning and seemingly understanding, suddenly , he doesn't like my friends, most of my family, we cannot talk good for a week without him behaving like an a**! for simple things like changing a radio station and he doesn't want to break up. I'm still with him because I believe every relationship has it's ups and downs. The only happy point is that he has a son who is so wonderful and we get along great, I shudder sometimes to think that he will have to put up with him without any support if I leave. But sometimes I feel like I don't care and he could just go his way, I am trying not to get to the point where I write him off emotionally .
How do you know when to call it quits?
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