The fact that he hid it from you in the first place changes a lot; its like you said, he had time to communicate this to you and failed to do so because of how you'd react or fear of losing you.

Besides the point, the cards are essentially in your hand right now, you have the power and make him regain your trust with actions. Start over.

However, for now id just fake it til you make it, when you feel yourself getting upset or triggered by one of his actions, take a step back and tell ask yourself why and maybe try to explain it to him without upsetting yourself.