HELP!! My ex boyfriend changed and became a player and a thug, and I feel like its my fault, I want him back?

Anonymous
I was in a relationship with this guy for 5 years (we are both 22), I cheated on him with my coworker & then I broke up with him because I did not love him anymore, he begged me to stay and that he would forgive me for cheating but I left him, he said that I was the most important person in the world for him. At that moment my career, friends and family became more important then him, he cared about me way more then I cared about him and I felt suffocated of his clinginess and niceness. He always bought me things, called me just to hear my voice, wrote me songs poems, called me beautiful a lot, got jealous and insecure and at the time I was not able to handle it at that time.

The break up was 6 months ago. After dating several guys & getting my heart broken over & over I came to realize that I was an A-hole and he was the best boyfriend ever. He was a nice quiet shy, skinny cute delicate sensitive frail nerd who kept to himself and his studies, he was very passive non violent. He donated to charity a lot and did volunteer work. He was a beautiful person, but he changed..

Now he is a player dating different girls, he's gotten really muscular, he's more aggressive and quick to anger and fight someone, that he hangs out with suspecious people. He got arrested for several fights. When I first heard it I did not believe it. I drove past this street (On purpose) and I saw him there and he was different. He dresses differently, muscular and had a girl with him and guy friends who look dangerous. I Facebook messaged him one day and asked him why is he being this way and he said "why the fuck do you care? We broke up, and besides the only way to survive in this world is to adapt so I did what I had to do, fuck off, bye" I don't understand, its a little vague, and he stopped writing back and blocked me. How could someone like him who was so kind change so much and become such a different person? I regret everything, I feel so guilty and wish I could have him back.
HELP!! My ex boyfriend changed and became a player and a thug, and I feel like its my fault, I want him back?
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