Guy trouble!

[UDZETA]

Hello everyone, I am having total guy trouble. My boyfriend and I dated on and off for four years. The past year we were really serious. He goes to school in Florida and I go to school in Ohio. Well we spent all spring break together in Florida and had a wonderful time. We started talking about marriage and he will be finish with school there after this next year and he will be moving back to Ohio. I will still be in school and he talked about us living together. He had told me if I wanted to live together that there was no turning back and if I needed to date anyone else now would be the time before he moves back. And I thought about that for a long time. I will be 19 on the 10th of June and I will only be 20 when he moves back to Ohio. I decided that dating others might be a good idea for the fact that I have not really dated anyone but him. If I am going to get married I plan on only doing it once. I want to make sure he is the right one. Plus I'm only 19 I can't make a decision like that yet. Now I love him very much but I need to be sure that he is the one. I told him that I thought about what he said about me dating other people before he moves back and that I thought it might be a good idea. He then told me that he only said that hoping that I would say "no I don't want to date anyone else and that he was the one for me." I was sort of taken back by his comment. I talked this all over with my mom to get her feedback. When my mom was my age she had me on the way and was married. She did want me to turn up like her. She wants me to enjoy life and not rush it. She also told me I was smart for telling him I want to date others just to be sure. I am having a lot of trouble with this and I was wondering if you could help me out or give me some more feedback. Was I wrong for wanting to date others or should I stick to what I am doing? Please help me!!!!