How to get my bf back?

I have been dating my boyfriend since 4 yrs. and we had our breakup nearly before 7 months and the reason of our breakup was one of his friends who was my friend even. We became friends in Oct 2011 and then I started getting news that my bf is speaking to other girls and telling all the things which were completely wrong which we haven’t done anything. Then I started disliking my bf at that time and was close to his friend.

One fine day his friend proposes me knowing that I’m in relation, but I still was his friend. Then when my bf came to know about the proposal given by his friend to me he got very angry and we started fighting. From that day onward there were many fights and breakups going on . My bf started using abusing language on me and his friend could not tolerate it. And he came to me and said you leave him. He's no longer liking you and just wants to use you and as he was my best friend. I believed all his words and had a final breakup with my bf.

After few days his friend proposed me again and then I had started liking him as well, and we were in relation. Everything was going fine but one day my e bf come and gives me friendship offer and as he was my 1st love I could not ignore it. I accepted and we were now friends. We were having meets and talks and this thing my present bf didn’t liked and we had started fights and problems but they would get solved even very soon. But don’t know what happened to him. He suddenly changed after few days he started ignoring me and would talk to me or meet me only when he wants or his mood does.

Whenever I called him he would say I’m busy and after some time when I would be busy he'd like to talk at that time. There were no topics left between us in every small things he would get angry and scold me and put the phone off then he would only call me up and make me alright.

I started loving him more and more. Then recently my ex bf called me up and said I have an important work meet me urgently as he said. I thought there might be some problem and I ran without informing my bf. When I reached there I see that there was nothing so serious. He just called me for time pass and he had also called my bf there as he saw me over there. He got shocked and just left that place I went behind him but could not catch him up. After going to home when I called him he said that I’m busy I’ll speak to you later. I was like okay and when I called him at night he said that all is over and I don’t need you anymore. Just shut away from my life and never show me your face.

I requested him a lot I even cried and I also sent him messages on face book but he had blocked me. He said me not to call or text if I do so he would call up my dad and tell him everything. After all this happen I was very disturbed. I’m not able to do anything just thinking about him and listening to the songs which he liked. Then before two days my ex bf called me up and said me that he wants to patch up with me again. Now I’m totally confused. What should I do?

I just need my bf. I don't want to go back to my ex bf. I just love my present bf and want him at any cost. Please tell me how I should bring him back to me. I know that he's very angry guy (short tempered) but he's very loving too still. I don't want to live without him. Just want him in my life. Please help me out. I really love him a lot.
India, 2nd yr. degree , age-20.