why does it have to be so hard..

My boyfriend and i are just not working out. That’s so hard to admit because i really want us to work out. I love him with all my heart but we just aren’t right for each other and he’s done some very wrong things that just change our relationship. Even though it’s going to hurt like hell, how do i tell him i want to break up? It is going to break my heart into pieces. How should i mentally prepare myself and how can i get over him?