He wants time to think...what should I do?

I have been dating my boyfriend for 8 months...we have been on a romantic vacation together to Mexico, have spoken about getting married, and have looked into my moving to the city he is from. I live two hours away at this point. The majority of the time I go to see him...he is from a big city and I am from a small town. So it makes sense that I go there. We are very much in love...or so i thought. He ALWAYS wants me there with him and he tends to go a little crazy when I am not with him. He is obsessed about my past....asks me questions on a daily basis- always quizes me and will call me a liar if I dont answer right. The things he is obsessing about is just plain stupid,..things that do not matter to us. We have went over it time and time again....after his fits of rage he is back to his loving self. These tantrums usually happen during the week when we are not together and as soon as he sees me he is back to the sweet, loving, vulnerable man i fell in love with. But he can also be very cold and obsessive when I am away from him. So this weekend he was supposed to come here because it is my sisters prom and I am going to attend - he doesnt like it one bit that i am going - saying i need to get over highschool. We got into a fight sunday night before i left about his obsessiveness about my past again and then we made up - monday and tuesday he was back to obsessing and now last night he is threatening to break up with me again. This morning he says he needs a week away to think over things and he will let me know next monday or tuesday if he can continue this - he just can get over my lies. The lies he is obsessed about is nothing - when you are with someone at first you can divulge every little thing. He is upset about me saying i was friends with someone that had kissed me in the past - well he was my friend!! And that i called an ex a friend as well. I am so flusterd....dont even know what to do anymore...I know i cant contol him so i just said ok. Please help - i need a calm and rational opinion. He is crazy but i love him so much and want it to work.