Drunk hook up(first time) with roommate….

A lot of people say if two single people of opposite sex live together they are bound to have sex. But what do you do next? My story is: 21st birthday I went out with friends. Everyone went home after the first two bars, and my roommate and I continued on. Nothing happened when we were out (only physical contact was he laced his fingers through mine to pull me through the crowd) and then we went home… We hugged; me thanking him and saying goodnight. It turned into a kiss then one thing led to another and I ended up doing the “walk of shame” the next morning and had to go get Plan B… It was my first time having sex. When I saw him that night ( I was gone all day doing things) he was drunk again and he told me that it meant something to him and asked if it meant something to me. We ended up kissing a lot- I was sober and should have known better. He wanted me to go to bed with him and I told him not until after we had talked about the night before sober. He avoided the subject for almost a week(he doesn’t like to talk about things) before I told him we had to talk about it. Long story short he didn’t say much other than he is not ready for a relationship (had a 3 year relationship that ended 4 months ago). That is pretty much all he said. Which is very confusing because of the things he said “that night” and when he was drunk after (the night after my birthday) conversation ended with we are going to be just roommates and still close friends. I went and spent three weeks at his parents house staying with his sister (who is my best friend and roommate as well). Much to my distress his family brought up the ex a lot. In the beginning I thought that he was ignoring me but either I imagined it or later on he got over it because we hung out a bit with everyone else. One night all of us (Him, his sister, some friends and I) went to his friends for drinks. He got drunk and I was a little tipsy and nothing happened! We were just two friends having drinks it was great! Well I have feelings for him ( I liked him before we had sex)and I cannot shut the feelings off. Thursday night we all got drunk and well his ex got brought up and I left the room with my best friend and became hysterical. I cried for hours Saying things like “I can’t do this anymore.” I have never been an emotional drunk and it scares me how emotionally out of control I was that night. By some miracle he did not see me crying that night. I think about him all the time… I do not know how to move on with my life. I just want to go back to being just roommates. I am now back at our house and he and his sister are staying at their parents house until school resumes in September. So I will not see him for two months. What do I do? How do I get him off my mind? I just want to be roommates- well I want to be his girlfriend but that will not happen so how do I accept just being roommates and how do I shut these feelings off? Please help