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...
It can also be a outlet for sexual frustration relating to a spouse....or both to some degree..
In the case of those who end up cheating it is definitely a big factor in the first case which leads them down the slippery slope.
A person who uses drugs will have a higher chance of doing other destructive things to feed their addiction or going deeper to more dangerous drugs/behavior.
In the case of some cheating spouses the slippery slope lead to bigger lies and adultery.
They need to work on their internal issues and develop new ways to deal with their problems in a healthy manner and stay away from their drug of choice.