Hi Root,
Looks like you have been given a lot of useful advice. It is hard not to think about OW, but in reality what good actually comes from it? For me, it only serves to make me more anxious and upset. Why do that to yourself?

While I don't understand how a single woman could cheat with a married man, especially one with little kids, who am I to judge? As for H, I think of the A as an escape from reality, from himself.

Will I ever get over it? I sincerely doubt it but I am hoping as time goes on I will think of it less and less. The ball is in my court now. I have a second chance with H to create the kind of marriage we both want and love. You have that same chance too!