Help! Trigger warning

FBI contacted me with questions about a man I knew when I was 17... he just got busted for child porn and molestation. I know him because at 17 he did nude photos of me and was trading them with other pedos... I gave the FBI agent everything I knew and what my experience was... against my better judgement since then I’ve gotten married and have gone far from that life. She now wants to meet with me and I do not want to my brother was just murdered and the last thing I need is to have to relive this again. I told her I can meet with her or help her anymore with this case that I need to focus on myself and move forward.... I just want left alone... help