You've read of all these SOs doing all these horrible things. Do you know all the circumstances? All the details? Whether or not there are other issues in the marriage perhaps due to the secrecy? Do you know everyone's backgrounds? Their ages? The dynamics between the couple? Whether or not she has been, or she feels cheated on?
And are you taking into account all the SOs who are willing to work it out? All those who are supportive?
Please. Just walk a mile in their shoes before you make judgments. And stop painting with a broad brush. The issue is more complex than that.
And you be in a relationship with a GG after having misrepresented yourself for awhile, and then post your thoughts.