Was sent photos of my friends self harm at 12 years old

I had a friend at the time who was very mentally ill but also emotionally manipulative. They had been threatening to take their own life at the time and in response to my questions of 'are you okay?' or 'what happened?' they sent sent a photo of their self harm and blamed it on me. I have never had anything make me feel as sick as that did, I really did think it was my fault. I felt very responsible for their emotions and life. Even though it was just a powerplay and they knew I was too empathetic for my own good. I stayed up very late trying to talk them out of whatever they were planning. They verbally abused me the entire time. It was an extremely painful moment in my life.