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...
Recovering from something like this is a marathon, not a sprint. It took me about eight months to feel significantly stronger (which was setback a few months because he did not remain in NC like he should have and I was too weak to enforce NC), about a year to really be over him, and about a year and a half to trust my own judgment again. Everyone is different.
The healing really begins when you have NO contact and stick to it. Otherwise you will not heal. That was my experience. Good that you are going to IC, that should help you a lot.