Everyone assumed we were going to get married

I really really want you to reply back to my situation as I feel so helpless. I was dating the love of my life for almost 18 months. We were so happy together for the first year or so...it was heaven. My friends warned me that the "honeymoon" stage wouldnt last forever...but I believed it would. (im only 16 by the way).

Everyone assumed we were going to get married. I still love him :(. The last 4 or 5 months of our relationship though...we argued a lot. Just about stupid little things...but we did argue. a lot of the arguing was because I was extremely insecure and I always worried about other girls being prettier. He HATED this. I wish i werent so insecure because now he is done with me :(. He broke up with me kinda out of the blue just 5 days ago :(. He said he needed space and wanted a break and said he didn't want to be in a relationship. He told his friends that he is a lot happier now and he wasn't happy with me. He told me if we got back together it wouldnt be genuine and he knows the fighting wouldnt stop, and he wouldnt be happy anymore.

But I KNOW that if he gave me one more chance...i could make him happy again :(. I know i could. i miss him so much...its extremely painful. But i am doing what everyone is saying and trying to act confident. We are in contact though. Hes trying to become friends with me again. But i dont want friends. I want back the amazing times we shared together :(. Would it be a smart move to meet him for lunch in a month or 2 and discuss what went wrong? and ask him for one more chance again? i want to ask him if hes scared of being happy again with me because hes going to college and doesnt want to get hurt. I dont know. :((((((. But im extremely depressed. Before him i was also depressed. Im naturally pessimistic..but with him I found complete happiness. :(. i cannot get over him because now i feel like theres hope that he will want me again. theres no way he doesnt miss me too :(. theres no way. i need him back :( how can i convince him that together we wouldnt fight anymore? AND he could spend time with his friends?