You need to reassure your child that their coming out and telling you what has been happening or has happened was the right thing to do.

Tell them what happened to them was not their fault.  Let them know that they have your full support and confidence and that you completely believe in them

When they are talking about it don’t pressure them about the details let them give them to you at their own pace. 

Always be calm, don’t be overly emotional, which means being able to show your feelings but at the same time showing them that you are a solid rock for them