What is going on inside his head?

My boyfriend of 4 months broke up with me about a week ago. After the breakup, he said he needed space & that he knew we would be together again someday, he still loved me and he still cared. We still talked and we were still close like when we were dating. I asked him for his ex Jess's phone number to text her, because we used to be best friends but she kept texting him about settling down and we stopped talking [when we were dating for 2 months]. He said he didnt want to talk to her either, and said he'd stopped. He said he deleted the number, so i messaged her on myspace and asked her. So i texted her and told her it was done, and if she wanted him she could have him. She texted back and said she needed to talk to me. So she called me and told me about how every night he called her and said he wasn't in love with me and that he wanted to be with her and they would be together whether me and him were dating or not. I was shocked, because she would message me and tell me but i didnt believe her because he said she was just starting trouble. I asked him and he didnt answer me, which i knew he was trying to find a way to turn it on her, and that it was obviously true. So i texted him and said 'it's nice to know those 4 months meant absolutely nothing to you.' and he said 'isn't it?' I started crying, i couldn't believe it. I have Jess here for me now, but she lives an hour away. I see him everyday and sit by him in every cl we have together. The memories haunt me, and i cant find a way to let go. He doesnt want anything to do with me, but it should be the other way around. He was gonna live with that lie and lead me to believe we were gonna be together again, but now that i know he wont even look at me. It just hurts so much, i was in love with him. What do i do to move on, can you help me?