Hi Anotherlife. As I am sure you know it takes two to make a relationship work. I do not know how your wife feels about you but you owe it to your marriage to try and make it work. If you feel that is not possible then maybe you should move on. The other woman that you met will either be available later or she wont. But it is not fair to ask her to start anything with you when you are still married and living with your wife.
If you are serious about leaving your wife do it because of your relationship with her not because you met someone else you think is so great. The grass looks greener on the other side but it may not be.