About 2 years ago two others and I started a LLP specializing in SaaS development. As all of us have jobs beside the LLP all of us dedicate about 8-16 hours a week, which has been working fairly well with the amount of clients we had.
Today however, one of the companions just told us he now owns another company, which he established himself within a competitive branch without any prior notice.
He said this was due to his new job, which required him to be a freelancer. And we as companions had nothing to do with this, so he didn't bother to even tell us.
I don't fear for our company's secrets, as those are protected by our underlying contract. However I feel like he should have informed us beforehand at very least.
I am uncertain how to respond to said companion, and am uncertain if I am just overreacting to it. Should I just leave it be? Or if not, how can I properly respond to this behaviour?