God this, my number one share contact is my ex, who i broke up with almost 5 years ago, and literally havent contacted in over 4. This person isn't even a contact in my contacts anymore, yet still top HOW.
Technology is really reinforcing the correct behavior - if you think you don't want to talk to someone, DELETE them off your phone/social media.
I used to have the same problem until i took the plunge and just banished everyone i didn't like out of my digital life. If i don't want to interact with them, i just make their contacts poof/block them