dear liv, I agree with june, you,we are all strong. The time has come for you to move on. That is not a sign of weakness. This also takes great strength.
Your boyfriend already knows what he has lost. You spent many years together Liv, you must take with you that he did love you. I think he loved you as much as he was mentally, and physically capable of. he gave you more of himself than he did anyone else.
He chose not to seek help, and that was his decision to make. Ultimately, his fear of the having to come to terms with what was done to him, and the pain it would have stirred up, was what did the relationship in, not anything you did or didn't do, nor was it his lack of feeling for you. He let it win in the end, and there was nothing you could do to stop it. It was just to big.
Go and try to find some peace and happiness,you deserve it.