It honestly sounds like you’ll be able to teach future generations what to do in this situation. Your wife and you are basically best friends already and I think the only thing that will change is you living together.
The break up happened already, eight whole years ago, and you both got by it cleanly and supported each other in new relationships. She’s likely to be your biggest cheerleader in your future, and you make sure you’re the same for her.
Good luck with your future, and congratulations for finding your truth and happiness.
If anyone ever needed a practical definition of Love, you just read it.
There’s many different types of love. The fact you’re not sexually attracted to her does not mean you don’t love her or that there is less love in your heart for your new partner. Love is not a cake, it’s not finite! Quite the opposite. It hurts because you love her and you always will, and that is beautiful!