Am I cold-hearted for wanting to leave in this situation?

I need some advice. I moved 1,000 miles away from my hometown where I was born and raised to live with my boyfriend. We've been here for about six months. I love him a lot, but I'm not happy here. We live with his dad, and his dad's girlfriend. His dad and I had a really big fight the other day about something his girlfriend lied to him about, regarding me! I got very angry because he wouldn't listen to anything I was saying, and he ended up screaming at me, "You don't want to holler at me, because I promise you I am the wrong person you picked to holler at." This to me was very threatening, and I don't feel comfortable here anymore. He also said he wanted us out of the apartment and that he was leaving on the 1st so we "better figure out where we're going." Also, I have a prepaid college plan in my hometown, and want to finish college so badly. And I miss my family so much. So I decided to move. I already put in my notice at work, and had planned to leave in a couple days. But, my boyfriend can not come with me, he has an obligation to school here, and will owe a lot of debt if he just leaves. Today though, his dad said we could stay, and he's going to keep the apartment. He asked me to stay here with him until September, and then we can go back to where we moved here from. (He would never consider long distance) But, I want to get out of here now! I'm hurt that we will have to separate, but I miss home so much, and I don't feel comfortable being here anymore. He's getting upset and sort of angry at the thought of me leaving, so I feel like maybe it's something I shouldn't do. Advice? Opinions?