You need to ask yourself the question, are you better than this? Or rather, can you be better than this? Because right now you are not. Your wife is too afraid to leave you and the security you provide and she enjoys that. She is also in pain, she doesn't have the confidence to leave you, a man she doesn't love, because she doesn't feel she can provide the security for herself.
So if you are not ready to face the truth and better yourself, stay exactly where you are. If you think you can, you need to find ways to move on. Honestly this is the best way for both of you to work out anyway, if you move on and feel confident and your wife gains confidence as well, then you could work. But right now you guys are both crutches for each other.