Ohhhhh Sister Henia.... I am so very sad to hear your heart is hurting like this

You are such a sweet, gracious, intelligent, talented & classy lady -- the most wonderful wife with such a heart of gold. You really don't deserve this kind of stress and distress. Insha'allah your husband knows this and will take the necessary steps to protect his wife and his marriage from this kind of hurt and harm. Trust is the single most imporant part of a marriage, and insha'allah he will realize that he must rebuild that trust so that you may feel secure and safe.
There is much advice and insight here. Some are reading between the lines for possible clues. Some are stepping away from some of the emotion of the moment to be more pragmatic. Both approaches are important. But please remember: we all love you and we want only the best for you. As has been said, you are a very smart cookie. We are so far outside the situation -- we can't know everything you know, but can only speak from our own personal experience and intuition.
But I have confidence in you -- *you* know your husband best. You will get to the bottom of whatever it is, and make the wise decision for yourself, your daughter, your marriage, and your future. You have already taken the proper first steps to address your concerns in a very mature and sensible fashion.
You are in my thoughts and prayers, dear sister. God is with you. He will help you find your way through.
-MK