Anything bothersome that affects a persons mood will impact their relationship to one degree or another.
Its impossible and unrealistic to expect a rule to alter that-its nature.
That doesnt mean that they cant or shouldnt manage the issues that arise, but managing thigs doesnt mean pretending they dont exist while in the company of your lover.
Yes-I am the hinge in a V. Been with bf for 20 years and dh 15 yrs. at times dh has had other women. Bf is mono. At any rate-yes-any time something strains one person, it affects everyone to one degree or another.
"Love As Thou Wilt"