Ray1010...
First, you did well to reach out to others. Here are some thoughts.
It's an aphorism that each of us spends the first half of our lives living for others, the second half of our lives living for ourselves. Where the dividing point comes is different for each of us, but "middle age", or that time when you realize that there is less life ahead than there is behind, is a common separator.
At that point, one realizes that looking backwards no longer makes sense unless you intend to go that way. At that point one realizes that the social norms of vanilla life are not the only option. For some, they are not the best option.
Many if not most who are drawn to alternative lifestyles--nudism, the LS, whatever--are drawn to them and to the people who choose them because of the transparency and candor. It is not just what people "do" as forms of expression, it is who those people are--and in most cases, they are people who have found the courage to be themselves, to express themselves, to give of themselves on their own terms.
You..and she...might want (her to) leave the lifestyle. But we would strongly wager that neither you, nor she, wants to compromise your shared core values of honesty, affection, trust, communication, and the honor you have shown for each other. Those values (there's an acronym there: HATCH) are strongly held by many couples that we have encountered in alternative lifestyles. One can reasonably assert that participation in this or that alternative lifestyle is simply an expression of those core values, and one that maintains integrity with them.
The fact that you found this site and reached out the way you did shows genuine curiosity. You didn't post out of fear, or disgust, etc. You posted because you were curious, and because you care for and about your lady.
You respect this lady who has freely admitted that she has enjoyed sex for physical pleasure with multiple partners, you are in love with this lady, and you embrace her for all of who she is. You want to go forward in your lives together, and you recognize all sorts of uncertainties and unknowns. This leads to three fairly solid conclusions:
1. You have crossed into life's second half. You are doing what feels right to you and for you. Congratulations.
2. You have found courage. Recall Thucydides words: "The bravest are surely those who have the clearest vision of what is before them, glory and danger alike, and yet notwithstanding, go out to meet it." You understand that there are uncertainties for you and for her, but want to move forward. This is life in purest form.
3. In trying to understand her life, and the lifestyle, and reaching out here, you have dipped a toe into the lifestyle yourself. You have discovered that it is populated by real people, with real lives, who see the world differently. The LS is not defined by its consensual non-monogamy any more than the vanilla world is defined by marital monogamy. It is defined by the people who chose to live differently, relate differently, love differently. You have gravitated to your lady's authenticity, her honesty about who she is.
You might share this entire thread with her if you haven't already.
Good luck and have fun.
FL