Most Helpful Guy
Try to remember that your mistake wasn't trusting your husband initially. It was overlooking the fact that he wasn't actually changing after he cheated. Its nice to think that we can magically learn to spot 'good people' vs 'bad people' and only trust good people and never be hurt.
Well life doesn't work that way. And building a big shell around yourself is no way to be happy.
Instead, like I said, recognize that you will trust people, and some of them will disappoint you, and what you need to do is trust that you WILL cope with life's disappointments, but you will also be more willing then you were before to get OUT of a relationship that's bad.