"Even how long you've been close to someone that doesn't change the fact that they can change"
Bond is like a flower that can either thrive or die overtime, just like in love it can be beautiful in the start but as time passes it will soon show the bad side. Because not all bonds are meant to last. Even if your relationship lasted a decade or so this doesn't mean that it will last until the end. And that's a fact, not because you've each other for a long time means that your bond won't go dull in the future. People change and it's normal because it already bound to happen. Some might get threatened and wants to preserve that particular bond, but all I can say is that it can hurt the other person but can also hurt to you.