For the most part, I recognize J.S. Bach to be the greatest composer in the history of all time, but he can get boring, if you listen to it too much. When it gets boring, does it mean that I don't like Bach, anymore? Absolutely NOT! And then, I take break from Bach for a while, and listen to some other stuff I like, but eventually I get back into his music, and I get amazed, again. It's a natural process.
I'm sure the reader can come up with all sorts of similarities with the Bach thing I mention. But, somehow, our love interests between other human beings is a thing that is somehow supposed to work differently. Instead of developing a very positive and strong network of lovers, we repress our emotions, and limit the potential for a strong network to form. And so when you are introducing yer wife to a gal you secretly love, and that gal loves you, too....you create damage. And then you think that maybe you should divorce yer wife, and all sorts of conceptual bullshit.
There is nothing in nature that says you should dump yer wife, just because you have taken a liking to some other chick. Whatever sort of conflict that arises is based on conceptual bullshit, and social conditioning. And then, the breakup turns into a very difficult experience, filled with lots of negativity for the couple that used to be.
It doesn't have to be like that. A network of lovers can be even stronger than some monogamous relationship between a chick and a dude that are struggling with, and repressing desires for other people.