Best of luck on this - I also think that you are doing the right thing. Life in many ways is about making choices and living with the consequences of those choices.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .