I would left the 'husband' and also the 'friend' too. Why? Because, first of all no friend should ever done this 'thing' to their friend. It doesn't matter if they're married or not. No friend should've done it. Secondly, why i would left the 'husband' is because clearly he cheat on you. Even worse, with 'your married friend'. And whoever told you that you overreacted, tell them if you try to hook with their partner, what would they do? If your husband is the one who told you that, tell him that you wanted to hook up with one of his bestfriend and better you wanted to hook up with 'your friend's' husband, then see how will he react to that.. Everybody always said that payback is a **tch. About your children, tell them nicely what happened. You cannot kept them in the dark for a long time, they need to know what happened with their parents. Do not be ashamed of it, it is not even your fault. It's their fault. Do discuss this thing nicely with 'her' husband. Once a cheater, always a cheater. You might save 'her' husband life and their childrens' before her infidelity 'pop out' with anyone's husband again. About saving the marriage, I'll rather not. Your husband told you because he's feeling guilty, not because he's really sorry. You may forgive him but you will never forget. Then, because of one thing, you will started to become insecure because of him. I rather left my husband than blaming myself because of his infidelity. Or deep in your heart, you wanted your husband to feel the same as you feel, so maybe you started 'something' with 'someone'. And then, you will feel guity. I rather walked out of this relationship with my head held high. Your husband doesn't even deserved a tiny bit of your love. He will never accept your 'friend' invitation, if he loved you enough. I maybe sound a bit feminist but if a man make you feel unworthy, dump him immediately. He's bad for your life. I hope you make good decision. Wish you the best in your life woman! And remember this, it isn't your fault that he cheated on you, it's his.

P/S: Sorry about my grammar though..

Cant believe you would consider ever speaking to this woman. Remember! The overreaction comments always come from those trying to mitigate the impact of their actions.

I want to seduce somebody's wife. 

I would love it even more if He was

there to help or watch & cheer us on. 

What caught my attention is the fact that they didn't go through with it because you were becoming suspicious.... What? So the love for you wasn't behind the fact that he decided not to, it was due to you being "suspicious". I for think you did the correct choice elimating communication with her. Although, I just hope by ending contact with her, it means. She shouldn't be near your husband and she shouldn't expect caual conversations. Although, the children should be allowed to continue frequently seeing one another.

Don't let the childrens suffer because the mother seem to have had some sort of sexual frustration or sexual interest.