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...

Even though you feel like there isn't anything he can do, it probably isn't good to hold these emotions inside. And it might give him a false impression that you aren't feeling them anymore. Maybe pick one day a week to just talk about how you're feeling, even if it's the same talk each week, it is healing just to get it off your chest. And if you feel that you need to talk more than that, we are all here to listen and support. Big Hugs!!
Thankfully, things have gotten much better and time is definitely a help. If there are things you need to talk about, do it. Don't suffer in silence. You didn't ask for this pain. Just try to make sure the discussions are constructive. Hang in there. Sending you support.