because I would not want to intrude and she would understand.
Faint heart never won fair maid. Seems you make the decisions for her.
What gives you the right to make the decision for another?
It might be she does not love you and you are scared to find out.
You do not appear to have given her chance from your replies.
I don't think she would understand and I am sure your answers do not allow us to understand.
Women never alway tell men how they feel and some men just decided for themselves.
If a woman evasive in her answer then she does care but unsure about the other person.
Wouldn't you like to know if she cared for you? Well then a smile and a nod is not enough. Unless you had an affair and she is married. Then it is a no go area. No nod or smile should be given.
Once someone is married the person becomes out of bounds and you should never let them know how much you might love them. If they divorce then you can tell them as long as you were not part of the separation.