I Am Getting Harassed By My Ex Boyfriend

I broke up with my boyfriend of a year around 2 moths ago, ever since then he has been constantly contacting me about various things. A little background info is that it wasn't the most health relationship that he was very emotionally dependent on me and was sometimes unintentionally manipulative. It just overall was not healthy. We had the same friend group and most of the group has either cut him off or overall limited contact due to how he treated our group (all of my friends have also had bad experiences). Also I opened up to a few people about our relationship and my friends have also spoke about their experiences with my ex. The problem is that this information has been going around through all of our friends and mutual friends and even people close to him. Ive been getting texts for 2 months about how I am destroying his life, being a horrible person, how everything is my fault. I was ok if this talk was only to me but he has started to harass my friends and is becoming a little threatening. I just overall want this whole nightmare to be over but i don't know what to do. I have been ignoring his messages but he is starting to try to reach me by contact through my friends. any advice would be greatly appreciated.