Everything you just said (I miss her, I want to be with her) is all about you.
Yes, in most cases it is ideal for children to grow up with an in tact family but sometimes that just doesn't happen. And children can't always get what they want.
Going back to my question... if you love your W so much and are willing to do anything for her then why are you not doing what she has asked for a long time... letting her go and moving forward. It is because that is not what YOU want. So really, all this is about YOUR desires, not hers. Why is your desire more pressing than hers? You have never given her the slightest opportunity to regret her decision as she has NO CLUE what it would be like without you waiting in the background.