1. delete person from your phone, email list, and social networking sites with no explanation, and ignore all of their attempts to contact you afterwards.
2. give them a brief explanation as to why you are deleting them from your many forms of contact, and then go on to do it.
3. leave everything as is, respond cordially to their messages/calls, but begin to slowly distance yourself and weed them out of your life.
4. some other option? please explain.