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...

Sometimes we can process them and then move on without every speaking them. The feelings pass and we move on with our lives.
If it is a day or a week later, and you are still bothered by what you were feeling ... then yes I think it should be shared.
My unusually optimistic response is brought to you by painkiller haze while nursing a broken foot.