I need advice on how to handle this situation please :(...?

My dad recently told me that im not allowed to have any communication with my boyfriend. Our age difference is 3 years apart which bothers my parents, i understand that. But my boyfriend and i have never done anything. We're just high school sweethearts who love each other very much. We've been together for a year and they've never said anything to me, until now. This is really hurting me and my boyfriend. I haven't talked to him for a week and a half and its really hard to adjust to talking to someone every day and then never talking to them at all. We live four hours away so we never saw each other much as it was and the thought of never seeing each other again just kills me inside. I lost my best friends because of this, and i have no interest in talking to my parents at all because of how much they're hurting me. I've always been respectful to my family, quiet, and minding my own business. My boyfriend made me really happy; happier then i've ever been before. Now im depressed, upset, have no confidence, and im un sociable. I feel lonely and just want my boyfriend back. They're being too over protective. Im old enough now to make decisions for myself but im afraid of the consequences of arguing with them anymore then i already have. I'm tired of putting on the fake smile every morning when i know that when i walk in the front doors of my house im going to start crying. Can you please give me advice? Are my parents doing the right thing?