I understand the toughness- I almost made the same mistake- I have been married for just under 7 years, we have 2 kids. We were not communicating, not really talking to each other. It was like having a roommate. She internalized it and so did I- we never talked about it just went about our daily lives. I came really close to cheating and it hit me to talk to her about what was REALLY going on. I had decided that if these issue we couldn’t work out then it was time to move on.
Upon talking and getting everything out on the table, and a huge knock down drag out fight. We came out in the other end with a better understanding of each other then we have ever had before. It is completely amazing now the difference that transpired when that respect comes back.
I cant tell you what to do, all I can do is share my experience. But in my opinion (especially with kids involved) talk to her and figure out if it is even salvageable- of it is not then move on.
You go go and cheat, that hurts her, hurts the kids, in my opinion just makes it worse. And eventually the marriage is going to be over anyway.
Again, my two cents