If you love her you should tell her if he wants to be exclusive with her lover you will support her 100%. A hand job from her on special occasions such as when she learns she is pregnant with her lover's ...... should be sufficient for you.
After the honeymoon I hope you retrieved it by sucking everything out of the condom. But I don't think your wife's lover should ever wear a condom with her, only you.
It shouldn’t bother you. We all get more excited when things are different and new. You still get to enjoy her as well so enjoy the fact she gets pleasure from others but always comes home to you.