A LAWYER IS THREATENING ME THAT I HAVE TO SHOW CAUSE

I have a girlfriend i used to talk with but his ex boyfriend is creating problem for me .she made me talk with him but he said abusive words to which i recorded after some months now again he has came and said to her to not talk to me. I talked with him on what\\\'s app and he said i have to show cause for that ,he is a lawyer and practicing for some months