Oh honey, your engagement didn't fail, your fiance was deceptive. Had he been honest and told you about all the skeletons in his closet, you may or may not have become engaged to him. It would have been your choice. By keeping it a secret, he took away your power to choose. In a sense, he entrapped you.
This is indicative of his character, and unless he has some serious IC to deal with the reasons he lies in order to keep people around, you will have to live with lies all your M.
One would think that a relationship would start based on truth. When the children come, and the business sets in, there is enough stress, but to have to deal with a liar on top of it...oy veh.
Take care of yourself. I can guess that those who were invited to the wedding would rather not participate in something that is going to end up in a D someday anyway...their being able to going to a party is not more important than your LIFE.