You'll always have feelings for your first love, particularly if you see them after a while - it's like being transported in a time machine. But, you can never really go back. You are probably a little in love with the person she was when in you first knew her. But she's not that person anymore, and you've changed too.
My advice is to do nothing. Don't see her again and get on with your life. The feelings you are experiencing are nothing more than powerful memory. You know when you listen to certain music or smell a perfume and the feelings of the past rush back as though you are experiencing them right now? The same thing happens when you see someone from the past, and that's what you are feeling now. From what you've described about her - too snobby to date you in the beginning and now made a mess of her life - you've had a lucky escape! Thank your stars and go out and buy your wife a big bunch of flowers.
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