Avoid Taking Any Impulsive Decisions
It is true that emotions will be running high at this point and you will be distressed and hurt, but do not take any hasty decisions that you might regret later. Don't pack your bags and leave the house in a huff or call up your lawyer to start the divorce proceedings. Instead take time to come to terms with the shock that you are feeling. Sleep over it and think calmly about the situation after a day or two."