Obvious mistake to think that your spouse feels and values things the same way you do.
I think this must be a common mistake and only obvious in retrospect.
You responded to my earlier post with some questions about how/why I got to where I am, and I think that this type of mistake was a huge part of the troubles in my relationship, my partner expected me to think and behave as he does, but I am not even similar. Additionally, as you referred to Passionate Marriage, I was (still somewhat am) co-dependant in the sense that my self esteem was greatly affected by H's actions and reactions.
The more that I read in books and conversations such as these, the more complex the issue seems. I truly appreciate being able to hear about other experiences and perspectives.