Why is he still contacting me?

Ok I broke up with this guy who I dated for 3 months but we decided to take it slow..then I found out that he was talking to another girl and I freaked and told him to get lost but he didnt listen he came back and said I was way out of hand or whatever … And I fell 4 it and then a couple of weeks later somebody texted sayin that he has a girlfriend at his school and I told him to get lost again..yet he came back saying whats it going to take for you to go back out with me and all this stuff..and like a fool I fell for it ..again…and we were doing pretty good till he got a new phone and had she is mii everything …[[otha chicks name]]..:<> and I was like somethings arent meant to be and he was like damn im so stupid I made a mistake now this was shockin to me b/c it was like he was calling there relationship a mistake well anyways I ended it on a good note and he still continued to text me and I didnt respond it hurt to much so I blocked him..I didnt talk to him for a month then he adds me on myspace and im thinking what does this guy want from me but anyways..we talked and he was like are you still mad at me and I was like yeah and he was like ohh im sorry I know I did you wrong if I could change it I would..now hes still with this other girl..why is he doing this to me?