MY mother says a friendship can never be over, no matter if you end up hating each other, they'll still be in your heart and at the end of your life, you hated them because you had a special, caring bond with them. You'll still love each other anyway tbh.
If you have a friend, they will often stay your friend. If you do end up breaking up with them maybe you believe that you are no longer friends but in your heart they are always there. This is proven as even if you hate that person you will always feel more secure with them as you know and like them in your heart.