My girlfriend and I worked together for 2 years under the same boss. Her and his professional relationship started to go "south". In the end, it became unbearable for both and together with HR they offered to let her go. She didn't agree and argued, so they fired her. She hired a lawyer, and now all these things are heating up.
Our boss doesn't know about our relationship. I am not taking sides as I need to keep my job - I depend on it 100%. The problem is that I start to feel that I am somehow involved, which makes me believe I'm betraying my boss professional trust. I want to stay neutral on this as much as possible in the workplace.
So when, if ever, should I disclose my relationship? Are there times where it is better for both the company and I, to disclose or not disclose the relationship?
For context this is all happening in northern Europe. Pretty secure labour laws and I am working on a permanent contract.