You keep responding instead of blocking. You are encouraging him to continue because he knows he gets through to you whether good or bad which continues to give him hope that you will cave like you have before. If you truly want this to stop, you are capable of stopping it. Sometimes we get caught up in the drama of the situation itself which makes it harder for us to PERMANENTLY draw the line. Find your own strength to put a stop to it instead of just replying you want it to stop. It takes action, not just words on your part because you know what he wants & he will not stop until you put a stop to this insanity by blocking all communication to him