When you find someone has been hiding something from you today, do not over react, there could be a good reason.
You are facing a disagreement or argument today and this is because it becomes apparent to you that someone has been hiding something from you. Try to stay calm and do not jump to conclusions, there might be a perfectly reasonable reason why they have done this, they may have had your best interests at heart. If you argue, seek a calm way forward as soon as possible.