I think it would be healthy for you to react as little as possible. Initiate no contact, take a break. Not giving up, but chilling. Focusing on you and your children. She isn't going anywhere, you probably have a better chance of this working out if you take a break/take a breath. Let some emotion drain. Trust me I know, as sick as it sounds, that negative emotion feels like it's better than none at all. It's still connection and it feels better than the idea of having no connection emotionally. But trust me, it's not good. The outcome isn't good if you don't fix yourself. I know you say you're fine, as did I. But.... Does your W see you as fine? Are you really fine. I would never tell you to quit or "give up". You would do you all a favor to take a break and recharge. As the man, the leader, you need to be as strong as you possibly can. Maybe a break from the emotion(a little detaching) would allow you to see something you haven't seen.
I don't care what you think, as long as it's about me.