Sarah,

I am sorry that this happened to you, but I think it serves as a warning to anyone who is in a relationship with a married person. If the relationship is secret, then there is always risk. Vanilla or BDSM really doesn't matter; on line or real life doesn't matter either. It is not a good idea to be involved with someone who is lying to his/her spouse about the relationship. There are possible unpleasant consequences like the one you experienced.
I think that some people are of the opinion that the unfulfilled need for the BDSM relationship justifies the person seeking an outlet elsewhere. My opinion is that cheating is cheating, no matter what the reason. You weren't lying to your master, Sarah, so you did nothing wrong in your relationship, but your second Dom was lying to his wife, and so he was doing something wrong in his relationship. You suffered the consequences of his deception. That is why I think it was a bad idea for you to get involved with him in the first place. I am glad that things did not turn out worse for you and that your employer gave you that break. You were lucky.