He apologized should I take him back?

I have a complicated relationship with my ex. about 3 weeks ago I told him I wanted a serious relationship, he said he wasn't ready. We broke up 2 days later. Four days later he got a letter on his door from my other ex with our text messages, one text I sent I said I was in love with him and he will never know what thats like. So after reading that he told me he wanted a serious relationship, but he confessed to me that the night before some girl who got the wrong number named ariel texted him and that they were flirting. (The little mermaid is my favorite movie ever, and he knows that) Anyway I loved him so we got back together, but I didn't know what he really did at this point. The next night he left his cell phone at my apartment for like 10 minutes and went back to his, which was kinda wierd coz he was like I have to check on my dog, twice... it was like he wanted me to see it. I looked at his texts, and the girl sent him pics of her face, ***, boobs, and pussy. She actually kinda looked like me in her face and hair and makeup, but prettier. He sent pics back too and he told her he loved to eat p***y and was saying something really sexual things. He came back and I told him we were done forever. The next day he came over to talk and he deleted her number, and I was happy but then I realized, this guy does NOT give a f about me if he would do that after only 4 days. So I destroyed everything he gave to me from his first rose that I preserved, to a drawing he used to ask me out on our first date and some other things as well. I felt sick all week after that, cried every night, couldn't sleep, and couldn't eat at all, I lost 5 lbs. I couldn't even look at another guy. He texted me a couple of days ago saying I replaced him quickly after 3 days with some guy with an xbox and that shows who really cared and all he wanted me to do was trust him. (made no sense) and I deleted it and then he texted me today this. "I know you've been with someone else. And you never want to talk to me again. I want to say Im sorry, and I miss you soo much. I've been really depressed. I've been blaring my music hoping you can hear it, But I don't think you can, and I don't normally do this but I miss being addicted to you. :( I know you've destroyed our memories but I would like to rebuild them and create new ones. If you don't text me back I understand. I still love you good bye." At this point I really don't know what to do. I'm ready to move on... but I miss him too. He lives next door to me. My dad is buying me a house though so I'm moving soon, he doesn't know yet. I'm 20 he's 23.