After 4 years together I told my bf that I have been unhappy and asked him to move out. Last night is the first night he stayed at his parents house. He tried to talk to me about things today and after I explained IN DETAIL why I thought this is for the best, he pauses a few seconds and then says "I just don't understand why?" I feel like he didn't hear a single word that I said. We have a child together and will have to be around each other regardless, so how can I make him understand where I am coming from (in a way that will sink in) without alienating him and being mean about it??