What about you? Have you been exploring some other connections as well? There seems to be a trend of partners opening up their relationship which seems like a great idea until the first person finds a partner. Life would be much simpler if new partners came in pairs..at least then you could both get lost in NRE.
Maybe finding another relationship for yourself will give you something else to think about while she is out on a date. Regardless, maintaining some form of balance is important. Otherwise you might end up feeling like a babysitter for your wife's adventures. I can't see that leading to anything but resentment in the long run.
Good luck and take care
Playing the Game of Life with Monopoly rules.
Monogamy might just be in my genes
Poly Events All Over