The thinking doesn't make sense. It's disordered thinking. Trying to rationalize with someone who is thinking like this ends up in circular arguments.
It's also projection- someone or something else is the "reason" for the issues and someone or something else must be the solution.
A main component of boundaries is knowing who you are- what is you, what isn't you. If someone has a poor sense of self, poor boundaries, they may be more influenced by ideas and identities but not realize the actual reality of it.
I don't think what your wife is seeking is just about having an urge. By going on the website, she shows up as a new person, with a new persona. No baggage or issues with anyone. She can then interact with people who are interested in her as this new person. It's seeking affirmation, positive attention. She can be an "open marriage" person in this new world.
Not with you. You know her better. She can't pretend to be someone else with you. I watched my BPD mother do this. There were a few times I'd be with her and her set of friends and think "who is this person" she seemed so different.
Somehow this met an emotional need for her. While at first, it feels envious that someone else got this "great" persona, I realized it wasn't real.
What you see with your wife, is the real one, not the persona, and as hard as it is, it's the real relationship, the good, the difficult.



