I dare say she dislikes you already: that she has confided in you is almost certainly born of distrust more than trust. You burst in on her doing something dubious and she is trying to neutralise it by involving you. Unless she is a very odd woman indeed, she would not pick the newest hire, and a young man at that, as a confidant on matters of the heart.
To prevent further confidences, you must adopt the role of gauche young Englishman (even if you are not English, this is the best role for you). Next time you must blush and look uncomfortable and give surprised utterances such as “Oh dear me”. This will make these conversations so sticky that she will desist. And when the blow falls on her she will be less likely to take revenge on you.
You could solve the problem by coming back to recession-hit London, where you would be less likely to have such excitements in your life. Though you would also be less likely to have a job.