Need Advice

My friend is dating a guy for a year. Recently she found out that she was video taped by him when having sex with him. She erased the sections showing her face and put the tape back so that guy couldn't find out this, he may think there is problem with the tape. Should she steal the tape and put away? She found out this by looking at his personal staff which she is not suppose to do it. She was so shocking when she saw the tape. Please give advice.