Man -- this quote scares me because you are still putting YOUR happiness in her hands. This statement says that if she doesn't end up unhappy you will be unhappy for the rest of your life. Well... you can't control her happiness so how about focusing on the things you can control? Like yourself, moving on, not worrying about what she is doing at all? I don't think she wanted to get divorced anymore than you did..its costly (emotionally and financially) -- she thought she was fully in love with you and could make it work otherwise unless you are extremely manipulative (and shame on you if you are) then why would she have gone through with it?
People make the wrong choices for them. Think of how brave she had to be to finally say something to you about it, think of how guilty she felt for having put you through it...she hurt you by leaving but trust me she would have hurt you more by staying...ever think of how she might have resented you, how she would have made you feel if she stayed around?