It's been a year and a half since I cut all ties with a long-time friend of mine. After over ten years of friendship, I think a lot of people would have a hard time dropping someone unless they did something catastrophic. Especially people who value Being a Good Friend. But Being A Good Friend doesn't make someone else be a good friend to you.
Some people think getting into your life early enough is all they need to do to be a life-long friend. Some people don't contact you unless they need something out of you. Some people don't know how to treat people with respect and don't care to learn. I'm not saying this as an indictment-- just fact.
This is a short post, but in the spirit of spring cleaning and new beginnings, I just wanted to remind you that you can get rid of pretty much anything you want if it is not helping you grow or be better. Just because you're used to something, or have put a lot of time and energy into something, doesn't mean that it is a good idea to keep moving forward with.