how do you let go of old friends and stop talking to them forever?

[SFE]

- avoid hanging out with or seeing them, tell them to leave you alone (only once)
(if you can't avoid seeing them on a regular basis, just stay away from them/ignore them.
if you have mutual friends with these people, inform the mutual friends that you do not want to hangout with your 'ex-friends' but if the mutual friends still want to see you without the ex-friends around that is okay!)
- delete their contact information
(remove e-mail contacts from any of your e-mail/messenger accounts, erase phone numbers/addresses from address books/cell phones etc)
- remove them from any social media
(facebook, twitter, instagram, tumblr, yahoo, youtube etc) DELETE AND BLOCK
- if they attempt to contact you either ignore them or reply ONCE saying you do not wish to have any further contact/communication/relationship with them
- go out and meet new people, make new friends
(social networks, school/work, join sports team, join a community group, try new activities or hobbies etc)
- live your own life
(focus on you, your desires/needs, your goals etc)
- spend time with family

Avoid any contact with them, do not even look at their profiles online.
Distract yourself with other people, activities etc.
Make new/better friends.
Focus on YOU, find new hobbies/interests.