Men- Why did he break up with me?

I met a guy around two and a half months ago. We dated for a month. In the beginning, he seemed very interested in me. Generally, he is upset and moody but when we started dating his friends said that he seemed to be a lot happier. When we first started dating, I told him that I wanted to wait to have sex. He seemed to not like that idea, but he respected my wishes. One night, we went out to the bar and had a few too many drinks and I grabbed him and kissed him. We ended up fooling around a lot later that night. He seemed mad and asked me why I kissed him the next day. I just laughed it off and said, "That's why you shouldn't get me drunk." We started fooling around some more every night after that, but never had sex until one night when I felt him getting excited. We would always fool around and then, he would masturbate so that I didn't have to do anything I didn't feel comfortable with. I felt bad about that, so I told him that we should have sex. He seemed worried and asked me if I was sure. I told him I was and we ended up having sex but he wasn't that into it. When it was over, he asked me why I changed my mind. I told him that we were practically already having sex, so we might as well. We had sex every day after that for about 3-4 days in a row. Then I got my period and we couldn't do anything. We went a while without doing anything, hardly kissing even. We started slipping into friends zone and I didn't even feel comfortable initiating anything with him. I brought it up once and he just laughed. We almost broke up over that. Two days later, we did end up breaking up. My question is this- did he break up with me because of sex? Or was our lack of sex because we had been fighting about other issues for a while and he just didn't feel connected with me anymore?