You are playing with fire going out with the single women. You know this.
As for the email, she pretty much said your struggles are over. Meaning, she's out and now you can live.
Let me tell you something. I have a friend who got married, had an affair, married the affair partner, had kids, had another affair on HIM, married THAT affair partner. She divorced recently and knows that her H would try again with her if she wanted to. This is on her mind constantly. Even though she is with the OM. She said the other day how she would be fine if her ex would find someone else. I said, "Of course you would. Then, that door would be shut and you wouldn't have to keep looking at it knowing that you still love him and should be with him." She didn't say anything, but looked at me knowing that I was right.
What can you learn from that tale? That your wife is watching and listening to what you are doing. Are you being a man that she would want to be with? Are you showing her your unconditional love? I think you are in many ways. I'm not sure saying that you liked that email was a good thing. Kinda like agreeing that you are moving on and better things will come now. I'm not sure going out with other women and having her find out is showing her love. I know, I know you are with a group and they are friends. But, you said you are attracted and they are ALL women. Get some guy friends, h4h.
What are some things you could do? NOT talk to her nicey nice like everything is fine, that you are sad but it's ok. All business with her. Focus on the kids. If you do talk to her it is about retrovaille or what she can do to get back with you. You seem to walk on eggshells around her, not saying what you want to say or need to say.....