I feel so heart heartbroken. How can we fix this :(?

I love my boyfriend so much, but he is starting to change, and maybe its all my fault for treating him like this.I moved to another country about 3 moths ago. For the first 2 months everything was fine we talked, texed, and chatted on the computer. But this last month I've been busy looking for a school, and helping my sister with her wedding plans, Well during this month we didn't text or chat as much and I started to notice that he didn't text me anymore and call me either. Last week i asked him for a reason and I asked him if he found a new Gf, he got mad and broke up with me. I kept texting him until he answered n we talked on the phone because i really want to fix this. He didn't want to but i begged him for another chance. But he seems different. I told him he had changed a lot and all he said was "yeah I did", and today I asked him if he loved me and he said he didn't know. I felt so heartbroken. He was also telling me mean things like it was my fault because i didn't text him as much and that i would laugh if one of his family members died, and i felt horrible. I don't know what to do. He told me he would try, but i don't know how to fix it, if it feels like I;m trying by myself. Any advise please :(