www.theguardian.com/lifeandstyle/2017/sep/16/what-im-really-thinking-the-other-woman
The sheer amount of mental gymnastics she's doing in order to justify her actions is astonishing! 
I've been cheated on in the past and yes I know the issue is with the MM not necessarily the OW but even so how could anyone be happy to live a life as a 'side bit' to someone else? Even if she proclaims to be some kind of independent woman getting on with her life. Fuck right off! You're still shagging someone else's partner. And when as these things blow up in one's face (as they tend to) then that's so many lives and hearts broken.