I married a man who does just this ... and for that I will be eternally grateful. He makes me a better person just by being who he is. You know, I've never heard him utter a single bad word about another human being. Isn't that amazing?
Seriously! You're still married yet you're having a "fling" or whatever you want to call it, with some new person. Does your spouse realize this is going on? I doubt it! (GREAT example that you're setting for your child, by the way.) If you're unhappy in your marriage GET OUT OF IT BEFORE MOVING ON TO SOMEONE ELSE!!! It really isn't that difficult! With the things that you're currently doing, you're making yourself look like a cheap whore!