Interpreting your comment charitably, you are exactly right that it would be simpler had this been the case.
Another fact: it would also be simpler had she not been (allegedly) lied to about the marriage status of the co-worker.
Another fact: it would also be simpler had she not been (allegedly) lied to about the marriage status of the co-worker.
If all of this is true, and it was the ethical baseline for co-worker relationships, what's the ethical baseline for client relationships?