His feelings for me keep changing lately, hot one minute and cold the next and I don’t know what to do…

My boyfriend and I have been dating for 9 months. From the moment we went on our first date we had the most amazing time. Ever since he’s been my best friend, my confidant and vice versa. My dad got cancer, and my family was going through tough times. He stuck by me and loved me and my family. He would do anything to cheer. He’s helped me he’s just been wonderful. We started talking about marriage fairly early on, he was the one to tell me that he wanted me to be the mother of his children, we just went about it but never set a date or got engaged we just talked about the future. Recently, we started fighting about little things; he would pick on me and make little fights. This was not like him at all. I asked him what was happening, and he said that he wasn’t sure that he wanted to get married and that he was “looking at other women.” I feel like this happened overnight. No other signs of this had ever come up, in fact he had only had eyes for me. We talked and he said that he wanted to work things out because I was the best thing that ever happened to him. He’s done some of the sweet things he used to do, and he’s been trying to meet my needs. Yet, I feel like something is missing, like the man who was crazy about me is not there. On top of that he is hot one minute like he’s normal and in love again then he’s cold the next like he wants to break up. I’m so confused and I feel like I just don’t know what to do anymore. Please help me.