Here is a little trick that will help (don't worry, this happens to all of us!) Read the answer in this link courtesy of kbalona. It works like a charm!
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 .