I don't know this guy so I can't say for sure what his deal is.

From your description of the situation, it sounds like he may have thought you were giving him the cold shoulder though. Then you saying that you wanted a friendly relationship indicates that you're not really interested in anything romantic. If he's a sensitive guy and had feelings for you, then it's possible that he feels hurt and used. That could be why he's avoiding you. He also might feel guilty too and not know how to handle talking with you at this point.

If he won't respond and you can't see him in person, then it doesn't sound like there's much of a chance for reconciliation right now. You may have to find another way to deal with your emotions regarding the situation. Your friendship or what of it can be salvaged may have to be dealt with at a later point.