Our expert says:
You don't mention when or how this happened, and what your age was at the time. If you were under-age, this was rape, whether or not he apologised and whether or not you enjoyed it. If it happened when you were an adult, then it is indeed difficult to understand why you might have done this. Either way, you need to see a counsellor / psychotherapst to work through understanding and getting over this. Don't allow yourself to be alone with your father-in-law again. Your counsellor can help you, after discussing the relevant details, to decide how best to cope with this and get beyond it, and what to say to your husband. You and the father-in-law cheated on his wife, and your husband, and both of you acted wrongly.
Divorcing your husband doesn't help, and is unfair to him. If you are indeed committed to this marriage, work with a counsellor on getting yourself sorted out, then work with a couples / marriage counsellor to sort out the marriage.
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