My boyfriend can really be a jerk?

My boyfriend and I have been together for four months. At first, he was really sweet and he would contact me all the time and just be a perfect boyfriend. He is my first boyfriend, and I love how special I felt and that he was thinking about me. As we dated, my feelings kept growing stronger. Over the summer, he went to England for a month, and didn't have munch internet. When he had internet, he'd inbox me or something on Facebook, but that quickly ended. He came home, and was totally different. He pretty much stopped talking to me and made me feel insignificant and he would say really rude things sometimes. I thought maybe school would help things, but they got worse, and he basically makes me feel like crap. but I really really like him and i know I need to break up with him, but I do want to be nice about it. How can i go about doing this with as little heartbreak as possible since he has already broken mine enough? I've tried telling him my feelings before, but he always makes it sound like it's not his fault and that we should try again. i don't know what to do! I can give more details as needed!