How to deal with a serious break up! (its long but please take time to read, thanks)?

Right, basically me and my 'ex' have been seeing each over for nearly 2 years. I thought he was the one for me so badly he made me feel so special and cared for without using cheesy remarks, we had a serious connection. There was things we would laugh about that no one else would and I knew he felt strongly for me though he could not bring himself to tell me he loved me in such words. There was a few occasions where I believed he could have been cheating e.g. one time his house phone kept ringing and he would not answer and I got curious so I called bk the number, just to find it was his ex I mentioned I was his girl and was arguing with her as to why she was still calling him she claimed he was seeing other girls and messing me around! Another time I seen texts in his phone from other girls and he was flirting with them asking one if she wanted to watch a movie sometime and snuggle up and she don't have to have sex if she did not want to. I asked him about this and he said it was a joke and he was sorry. Because I loved him so much I gave him another chance and everything was ok after this until the other week I was speaking to one of my male friends on fb and he gave me a compliment saying he thought I was good looking and a nice girl. I liked the status (Just to say thanks) and we got into a small conversation about telling him to stay away from the girls, because I see him as a lil brother. Anyways, his friends seen this and like the status and basically said that he does not think 'Lewis' (my ex) would like the fact that I liked the status and said he will tell him and said that he told him he knew I was messing him around :S. I was confused to why he was over exaggerating the matter so I rang my ex the next day numerous of times but he did not answer and cut the phone, ive called a few times again but he is not having it, so I sent him a text earlier saying he would regret the stupid decision he has made and I would not bother him again. The thing is I really want him back and have cried so many times my head is all over the place, I have kissed 2 other guys since this too whilst out with my friends..I guess it was out of revenge/being so hurt and missing the attention. It been 4 days, can anyone please give me advice on what I should do now as I really and truly feel lost and HURT!