<human>: Can you condense the text into three sentences or less?

I had been in a long distance relationship with a man in Australia (I am in the US) for about a month. The relationship didn't last long because it became toxic extremely quick. Constant fighting, mental abuse from both ends, and it was all around just a terrible experience. It was turning both of us into bad people and I wanted out of it, which I made abundantly clear to him. 

During our relationship we both said nasty, inhumane things to each other. In the heat of the argument I had told him to just go off himself, this has happened a couple times. I know it's extremely wrong to say stuff like that, but that's how toxic the relationship was. This brings the story to him threatening me with legal action.

Him and his family have been stalking my family, trying to find out my parents contact information and social media profiles to contact them about how bad of a person their daughter is. He has been contacting my friends, harassing them about our relationship. Both him and his dad keep harassing me, telling me how it is illegal to tell people to kill themselves and that they're going to contact the FBI or whatever. This is all extremely childish in my eyes and I'm not quite sure what to make of it.

I have tried blocking him on any form of social media, but he's constantly making new accounts or harassing my friends into speaking to me, which is just so he can threaten me with this legal action bullshit. I have made it so clear to him that I want him out of my life without these complications. I don't know where to go from here because I'm genuinely worried he might make this into a bigger mess than it needs to be.
<bot>: My long distance ex boyfriend is threatening me with legal action over me telling him to go kill himself in the heat of an argument, should I be taking him seriously or just block all communication no matter what he says?