Is it normal to b obsessed with someone that is hurting me everyday.

Ive been with my boyfriend for 2 years, but we've been best friends for 5. This is our first year in college and we are two hours away from each other.
It started off great because he'd come to visit every three weeks; but I eventually decided to take a break in the relationship. He wasn't happy about it,he cried to me on the phone everyday, and I took him back after 3 weeks. One month later, he broke up with me for good. I was devestated. I couldnt function or do anything and I was sure I was going to die. We both hooked up with other people and after 2 months, he took me back.I jumped the gun and said yes to going out with him even though I was insecure about the situation. I tried to tell him that i was scared he would "surprise" me again and dump me randomly, but he tells me not to worry. He tells me he doesnt want other girls, but at the same time, he tells me he doesnt like the idea of being with someone for his whole life and not trying around. Heres the OBSESSION... I ALWAYS keep my phone with me incase he texts me. If he does text me, i make sure to answer right away. He never answers me back as fast, so it leaves me theres waiting, getting sadder by the minute wondering what he's doing. He doesnt treat me special, he doesnt call me everynight, i have to call him. He says he loves me, but i don't think he does. I think he likes the idea of having a pretty girlfriend to hook up with. I'm always checking his fb to see who hes talking to and it just makes me sad inside to see his life flourishing without me. He always puts his friends before me, even when i come to see him, Moral of the story,I'm obsessed with someone I know is hurting me everyday.Why can't I just dump him and move on?