London has it 100% right.
They are in a closed committed relationship. One of their boundaries is not sleeping with others. She was respecting that relationship and her partners. She agrees to those boundaries.
40 yo straight female
Married in the eyes of the government to Butch since 2001...
Murf my monogamous second husband has been with me since May of 2012.
In a V relationship with an average 50/50 split of time between my two husbands.