Let them know you understand that is hard. Help can come in many ways. Let your child's teacher know your family is having hard times. The teacher can give extra help and comfort when your child is upset. Tell your child you told the teacher.
Children think the divorce is a secret because no one talks about it.
But divorce is not a secret for people who care about your child. Find another adult you can talk with when you are going through a hard time. That can help you feel better about yourself. Then you and your child can know there are good things in life to enjoy, even in hard times. It can take a long time for children to manage their feelings about a divorce.