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...
take care
Remember that you made this choice. He didn't.
Be prepared to face a lot of anger and frustration from him, as well as lots of questions and details he will no doubt want.
Be honest with him, it may be more difficult for you but he does deserve the truth.
Goodluck and whatever you do, don't ever forget how you feel right now, or the way he will look at you when you tell him. It may stop you from ever hurting someone you love in this way ever again.