First off u need to understand there is no quick fix. Also realize the likelyhood that it wasn't just an EA. read the the divorce remedy book and do a search here for other threads on the topic. There's people here u can talk to, it would help though to post a quick summary of your situation.

Have you read the book already? What drove your wife in this direction? The only things you can do is work on yourself, no extent of reasoning will sway her. Be patient, people have made it out of this I wish u the best.