Here are some suggestions that may help to deal with this situation:
Calm down first.
You may be very excited when you find out that your husband is cheating. However, you need to calm down first and don't make any impulsive decisions. Give yourself some time and space to think and deal with this problem.
Find evidence
Before you talk to your husband, you'd better find enough evidence to prove the fact that he cheated. These evidences can be phone records, text messages, emails, social media information, etc. Consider hiring a private investigator to help you collect evidence.
Have a spiritual exchange.
Once you have enough evidence, you can have a sincere conversation with your husband. It's not easy, but you need to express your feelings calmly and rationally and let him know that you already know the truth.
Find a solution
Once the your problem is on the table, you need to find a solution together. You need to let your husband know that his behavior has hurt you and your family, and at the same time express your disappointment and anger at him. You can consider couples counseling or marriage therapy to help you solve the problem.
Give yourself some time and space.
Dealing with her husband's infidelity is a very painful thing. You need to give yourself some time and space to deal with your emotions. You can seek the support of your family and friends, participate in psychological counseling or join a marriage counseling group to help you tide over this difficulty.
Finally, don't give up yourself and your marriage easily. Just because a husband cheats doesn't mean the marriage is over. Working hard with her husband to find a solution to the problem may make your's marriage stronger.