He drew a line because of the behaviors she exhibited and the bipolar just sealed the deal. He started noticing her behavior as being off and he also mentions her sex drive being too high. Sometimes we don't want a relationship because someone's nose is too big, hair to short or wiry, attitude too depressive but we don't tell the person the exact reason because we have some tact and may even feel bad about our reasons. I just feel there was more to this story and some people were filling in blanks based on their own situations and feelings (which is common). I see PC as a place for support. Sometimes we are triggered by the topic but should still attempt to be objective and gather all evidence. But I'm weird and see things others do not. I'm not saying I'm right, just saying how I feel.