
Welcome! I'm glad you found us.
A good place to start here is by reading the
Lessons. There is a lot of information in them that will help you out.
Basically, you have to trust your own sense of fairness on these issues - you didn't do anything wrong, and in fact were getting "chores" done. At the same time, she has a right to feel disappointed in your decision to work on the computer instead of coming to bed with her. There are no villians here.

The trick is to learn to become unenmeshed emotionally so that you can allow her to feel and express some disappointment, anger, fear, etc. without you taking it all personally. You can validate her disappointment (but not necessearily the reasons behind it) and take time outs (leave the situation) if she becomes abusive toward you.
It's not easy work, but it can be done.