How to help these kids through this?

My daughter is 16 her boyfriend is 17 he was in a car accident the other day. He is in the hospital right now in icu he broke his neck and we found out today that he is going to more than likely be a quadriplegic for the rest of his life. Of course he is taking it really hard my daughter has been friends with him since forever they live in the same neighborhood as us. At this time my daughter is wanting to stick by him and keep their relationship going. And yes she knows how his life will drastically change. But she doesn’t know how to help him cope and make him understand that she isn’t planning on leaving him. And I know that she’s got to be having a hard time with this also and I need ideas on how to help her also.