I think I need to break up with my boyfriend..

We’ve been thru a lot of ups and plenty more downs. I love him but I don’t feel in love with him anymore. And that’s hurts me because I know that would hurt him. He’s my best friend. We do everything together and have so much fun. I cannot see myself with anyone else, doing what we had planned but I just don’t feel happy. I don’t know how to break up with him or how to stay away after. How have you handled heartbreaking breakups?