I'm a bit confused about what the situation is. So he told you that he has feelings for you and then stopped responding to your messages and snapchats because you told him that you thought you guys were just friends? Did you tell him in the moment, that you thought you guys were just friends? Or did you assume he already knew you felt that way? I think he may be ignoring you for these three reasons, if you told him that you thought you were just friends:
1. He saw it as a rejection. Guys, believe it or not, have a very fragile ego. Hearing this probably hurt him more than you thought it did. He probably knew that you'd react this way, and it took a lot of courage to tell you the truth. The fact that he got shot down may have lessened his confidence level because you don't feel the same way towards him. He probably thinks something is wrong with him and is wondering what that may be: why doesn't she like me...?
2. He doesn't want to make things awkward or make you feel uncomfortable now that you know that he likes you. He's trying not to talk to you as often because he doesn't want to ruin the friendship. He doesn't want you thinking that it's different between you guys. You may be thinking that not answering is just causing a scene and doesn't make any sense. But believe me if he were to be answering you just the same, but this time you are aware that he likes you, you will realize that everything he's saying means something more than you would have thought it did prior confession. This will in fact make you feel uncomfortable and you will be the one who will end up not responding.
3. He's busy?
But I have a question for you anon: why don't you like him back? I answered a question earlier on about the difference between the love you feel for a friend and the love you feel for a.. Well... Lover. You can check that out. Maybe you should give it a try. If you are really good friends you must like his qualities and spending time with him which are both things that are important to have with a lover. Then again there are some things that may be standing in the way of this happy ending. Aren't there always.
My advice to you is try and drive him away from the feelings he has towards you. Put him in the friend zone and make it as clear as possible that you are and won't be anything but FRIENDS. Try your best to contact him just the same as you did before his confession and make it seem like your back to being just good friends, but do this in a very careful way so it doesn't seem like you are leading him on. Talk the same way and act the same way and hopefully he'll get the idea. This is the only way you can get passed the awkward phase post the confession which tends to be in fact very AWKWARD.
And who knows maybe sometime in a few years when life isn't so much in the way you guys can try it out. Hope this helps :)