Broken

I'm new here and I'm full of emotions. I have 3 children from the same father. They are 15, 12 and 10. They were abused when they were very little by their bio father. During that time my middle son was nearly attacked in the woods by an 18 yr old boy. This same child of mine, just last week, came to my husband and I and told us that the gay neighbor across the street from us has for months been doing sexually things in front of him. We were so close to this man and trusted him fully to take our son fishing in our neighborhood, on a boat ride and various other activities. My husband and I were groomed so well by this man and then he groomed our son. Justice is being served, but I keep blaming myself and am broken. I need help and support so badly right now. I don't know how to help my son heal from this. This is the 3rd time this happened and I've never even heard of grooming before.