You picked an interesting time to ask this question, and I don't think you're going to like the answer. What you're describing is a claim for alienation of affection, sometimes called a "heart balm" tort. Alabama did away with the claim of alienation of affection 70 years ago, at least as it relates to a claim againlt a man for alienating the affections of a woman. You'll find the statute at Ala. Code ยง 6-5-331. I say you picked an interesting time because the Alabama Supreme Court just decided a case dealing with a claim like this, and I just blogged about the case at
http://divorceinfo.com/blog/?p=353.
The only glimmer of hope I can offer you (and it is only a glimmer) is that the statute and the case both deal with claims against men for alienating the affections of women, and you're discussing a claim against a woman for alienating the affections of a man. If I were the judge, I would throw your case out in a heartbeat, because (a) it might be gender discrimination to allow a claim against a woman that couldn't be prosecuted against a man and (b) as the boss, your husband had superior power to that of his secretary in the workplace, and it was his responsibility to enforce appropriate boundaries, not hers. Fortunately for you, however, i am not the judge, and yours may see it differently.