This is a bridge in Paris. You hang locks on it with the name of you & your boyfriend/girlfriend/best-friend then throw the key into the river. So even though the friend/relationship may end, you can’t remove the lock. It stays there forever, as relevance to someone once a part of your life.
Professional Fangirl. I could list all the fandoms I'm in but we'd be here forever, just scroll though my blog, you'll get the idea.