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
Start a diary and write in it every day. I tried to do this several times, but ended up giving up after awhile. One day I'll manage to stop being so lazy and start a diary that I'll actually write in at least once a day.