I would pump the breaks right now.
It would be one thing if she was separated but not divorced but the fact that she is only “considering” divorce worries me.
Did she mention if her husband is considering divorce as well? Or is he going to be blindsided when or if she tells him she is considering divorce.
Can you elaborate about her “considering” divorce? Does she seem like she will eventually make a decision or do you get the feeling she is just going to “see how things go”?
I agree with what others have said. If she is going behind her husband’s back then I would tread lightly and maybe say to her that its not fair to her husband to continue this and that you would be more than happy to pick up where you two left off once she has told her husband.
CBF