I don't think that their relationship

is normal co-worker relationship. We are adult, we all know how we should act towards our co-worker, definitely not to call somebody home about personal things.

You have right to be angry, but you need to control yourself and not to make things worse. If I was you, I would call my girlfriend to let my anger out. You need to watch how things go between them. I hope that your hu*****and will not do something to hurt you.