You broke his heart. This is why we always have to think long and hard before we mess it up with the other person in our lives. Maybe this HAD to happen to you so that you will learn for your future relationships. Apologize to him if you REALLY want to be with him. Even if he really really loves you and even if he forgives you and takes you back, things won't be the same for either of you. This negative experience will always be hanging above your heads. There is a lot of healing to be done.