Help me i'm in great pain.?

Here's the story to my journey with this person, i've been in love with this person 4 out of five years we've known each other, was boyfriend and girlfriend for three and a half years. There was a time before we ever became friends, that i liked him and he liked me but he chose this over girl over me so i sucked up my littel broken heart, and decided he was important to me enough to be friends with, so with our friendship we grew into being best friends, he confided in me than he did his girlfriend, everytime they would have a fall out i would repair their relationship by giving advice, so then months later he fell for me again. He tried flirting with me, but i refused for him to cheat if he wanted me he would have to break up wit her, and so he did, but i still refused to give him any flirtation back, i just remained as a friend, but a month later i realized that he had a personlity that intrigued me and through our friendship i gained strong feelings for him, i realized i loved him. We soon got togather and always spent time with one another at his house and everywhere, met his whole family and they loved me, our moms were friends, so it was easy to be with him. Five months later, i was having difficulty in my life with my mother and confided in him and told him how i felt about her, my mom found out and she fought with him and i and he cussed her out and then she told me im never allowed to see or speak to him again, but i never gave up during that time period i found out i was in love with him, even after the times he mistreated me to love someone you love them for who they are not what they give you and you accept them for their flaws, the memmories we made just made the love stronger, the journey we made togather. I took risks for him, i saw him when i wasn't supposed to had to use up all my mintues to talk to him saved myself for him, for 7 months i couldn't see him until i decided im going to try my hardest to, i was the one to visit him i gave him presents all the time i forgave him everytime he hurt me, everytime he cried to me i would pick him back up, we waited a year to loose our virginity to each other and had many times. but after four years, we went on a break for two months i asked him why? He said he needs to find himself, needs to figure things out, i questioned him if its about another girl? He said no, i had my insticts and saw how he acted and what he said to other girls that it was a lie, i saw with evidence, to get the final truth i went on my moms facebook and pretend to be her to get the truth out of him, so he admitted "Yes, i wasnt intending but during me and her break, this girl caught my eye and i've been bickering back and fourthe she's now my girlfriend" When i found this out i cried, while on our break he had with me he cheated on both me and the girl. He promised me for four years he would never do that, he used me while he was with her, so i cried on the phone and yelled at him asked him why, after everything i gave up for him and i did, after all the times my family was racist and tried to make be stay away from him after all the times his mom mistreated me, after all the times he has hurt me and accused me of doing things i never done, yet he did it at the end of our relationship? He threatand me, and said if i tell anyone he will come up here and do something, then after an hour of arguing he talked about how good our relationship was, and how he fell for me so i decided to hang up. A week later i decided he meant that much to me, that i would consider to be his friend than nothing at all because we have a bond that could never get out of my heart, i truely love him, if i didn't i wouldnt have sucked up my pain all the time for him, so we were friends and he would still try to flirt with me then be a complete jerk to me and act really stupid, i kept seeing pictures of him and his girlfriend i got sick to my stomach, so i told him i had enough and i deleted him and he threatand me again to stop talking to his friends and to leave him alone, and i never talk to his friends i dont even know any of his friends, and i never try to force him to talk to me he did that on his own, so after i deleted him he went out of his way to block me i saw no point in that when i was the one to delete him? And ever since we stopped talking for three weeks he keeps unblocking me then blocking me? I don't understand why he keeps doing that, but i still love him very much, but he kept hurting me and using me, he hasnt tried talking to me hasnt even tried apoloizing, but i ache so much after five years of being his best friend and three and half years of being togather he does something so low such as this oh and to add he had his girlfriend block me? I never tried talking to her, or adding her, why would he do that? Why in the world does he keep blocking me and unblocking me? What is really going on, why did i deserve this?