Two things jumped out at me. The first one was when he kept telling you over and over that he doesn't lie. When someone is so adamant about something like that , it's not true. Never trust someone who tells you , "Oh, I never lie, you can trust me"! Run away at that point.
The second one was when you wrote that even his best friend said that he never thought that your bf could love someone that much. The best friend hit the nail on the head. He can't love anyone but himself. He is a manipulator, a sneak, and a con man. I am sorry to be so blunt, but I think you need to hear it. He never loved you. He was using you. He cannot love anyone. He is incapable of love. He is a sociopath. Get away from him as fast as you can. Please for your little boys sake.
H