Hi,
You did the right thing of being honest with your boyfriend. That would save you lots of heartaches down the line. It is not easy to feel rejected and it's understandable that he was upset. Now that you told him how you felt, you have to discuss with him the status of your relationship with him. By telling him that you did not feel the same way he felt means that your relationship has now become an ordinary friendship. It is now up to you not to give mixed messages. You need to politely refuse to go with him if he invited you to go to dinner, or watch a movie or to go somewhere with him that will give him a chance for physical intimacy. And the number of meetings with him should be less and less so that he will start forgetting about you and will make him try to find someone who will share the same mutual love feelings.
In the process , you need to be kind, understanding and compassionate because he is hurting . Time will heal his hurting inside.
You take care.