Am I crazy... Or is feeling this way normal?

Me and my ex weren't dating for a long time but I felt something differnet with him. I seriously felt like I've been under a spell or something. He went away to college in New York and Im all the way in Georiga, he wanted to stay together so we did. After a couple weeks he stoped talking to me because he heard I was cheating, when I never was. We broke up without even really talking about it becaause he dosn't know how to communicate. After a month we started talking aagain and I flew out to visit him and things were just a mess. It was different. I left early. And basiclly, we keep coming back to each other but he treats me like **** and dosn't know how to communicate. He's put me through **** I've never felt before. I felt like my heart got torn apart. . . I get really upest, I used to party all the time and see other guys, now I just don't want to do anyhing but work and concentrate on school. I just feel lke he's affected my life alot in a bad way and I want to feel like I did before, a happy flowerchild. But is it normal to want to be alone all the time? Im not deressed or anyhing, but Im not as happy as I was before. How do you get over somone? I usally don't give a **** if a guy screws me over, but this time is differnt.