This is true in relationships and also pertains to moving, having to say goodbye to family and friends, making a career change, saying goodbye to old habits/lifestyles,etc. Be Brave enough to say goodbye and life will reward you with a new hello :)
words to live by! Stop being afraid of what could go wrong and start being positive about what could go right. You only live once, and if you don't take chances, you'll never get that chance the same again. Take risks, it's what makes life interesting.