I'm sorry, heartshaped, you sound very sad right now as anybody might be.
He's a very unkind, duplicitous man who hasn't been straight with you. He's used you, as a pawn. Do you think it is in any way possible that the messages you've had from his 'wife' are actually from him posing as her? It would be an easy way for him to demonstrate his so-called commitment to you, wouldn't it? "My wife, she knows, she's all upset... I can't do this to her, blah blah".
I don't believe the messages are from her, I don't believe that he's told her at all - I DO believe that the coward realised that things are not running smoothly with you (because of his horrible behaviour) and he's moving back to the least painful option - his wife. I don't believe a word of what you post that he's said, although I believe you, heart - I believe he's told YOU these things but when he says he's done this and done that, I don't believe it. He has always done what is easy and the things that he's told you he's done are in no way easy, so completely out of character for him.
I wouldn't waste time and energy fretting about having hurt his wife because although you have obliquely, I truly don't think she knows about you or of you even. He is twenty-two shades of louse...
One day you will thank your lucky stars that you're no longer affected by him; but not for a while. For now you'll grieve for what you thought you had and it will be painful - but it won't be forever. Now is the time to find out who your friends are and let them do what friends do best. Absolutely make sure that he cannot contact you again, do whatever you need to make yourself louse-proof.
Best wishes, heart, you will rebuild your life and be happy again.