Infidelity Support Group
Any relationship in which one partner engages willfully in sexual relations with another outside of the partnership is considered to have experienced infidelity. This breach of trust is often traumatizing for the faithful partner as well as the relationship, and support is often needed to heal emotionally and to decide whether or not the relationship should continue after...
There will always however be doubts and that will never go away because of who they once were, even if they have changed 180. A path was beaten towards adultery and easier to be travelled on again.
Paranoia is irrational where as doubt is based on facts and probability.
There is an massive debt on their end and the trust is starting at a deep negative.
When there is cheating both ways the power balance is closer to equal but there is negative trust going either way.
Like betrayedtodeath was mentioning it just something they have to rebuild slowly brick by brick to a point where you feel it is solid enough. You will test it over and over till you are satisfied it can withstand the pressures of life.