Most Helpful Guy
He probably had a really really really big crush on you and I know how that feels. I like this girl a lot and if she friendzoned me I would be pretty upset but I like her so much I would miss her if we werent friends. Dont feel bad because you dont like him its not your fault. Maybe try and talk to him and cheer him up again and if he still doesn't want to be friends then I would leave him alone or wait until he comes back.
Most Helpful Girl
Don't feel bad. Rejection is part of life. He needs to learn that and respect your choice.