(((Adam)))
I recall your posts in another section of this site a couple (or few??) months ago, and I've got to say that I am concerned about you. Within a relatively short amount of time, you've found out that your wife has cheated online twice now. Before you even knew about that, something about a lack of connection between yourself and your wife was hounding you emotionally.
I think that it's good you are seeing a T. I hope that it's helping you work through your emotions and thoughts more clearly...making you look at your position in life with better understanding. It sounds as though you are spending a lot of time trying to figure things out between your wife and yourself, and I give you kudos for that!
I don't want to sway you either stay or go ~ I want you to do what you feel is right for you. But, try to back up a little bit and look at the entire situation with a wise mind. (A combination of emotional and reasonable mind) Write out a list of pros and cons of the issue/s haunting you. Talk with your T about how you feel from that point and try to determine what the "wise thing" to do is. Are you hurting yourself by staying in the marriage? Are you hurting your wife? What is really the most important factor/s to you?
In my experience, breaking the distress situation down as much as possible (without going too far & simply complicating matters) really helps a person figure out what the right thing is for them to do & feel better about their situation. It may not be an easy task, but you will feel better once you do it! The dread will no longer have that power over you (which is a great relief).
I hope that my post helps you challenge yourself to look at things from a more clear perspective and make the wise decision/s that you need to make to relieve the stress that you feel inside.