Yes, block him. Be strong this time. Be resolute. You have to have strong convictions in your mind and heart that tell you that you deserve FAR better, that there IS better out there to be had, that this guy is NOT worthy, and that he is dragging you down in life, rather than enhancing it.

You know it's time to let go when they drag you down, make you more anxious, insecure, and f-ed up inside. These are signs of an unhealthy and toxic relationship -- a good relationship FEELS good, you feel secure, and you don't consume yourself with thoughts of worry and anxiety. A healthy relationship enhances one's life, and adds more to it. It doesn't detract.