I rejected him over a month ago and I still don't know what to do?

A guy told me how he felt about me and I told him I didn't feel the same way. Ever since I haven't known what to do and I've been taking this out on him. We don't really speak anymore even though we have to see each other almost every day and the times we have spoken haven't been on good terms because, as I said, I keep taking the fact I don't know what to do out on him.
I rejected him over a month ago and I still don't know what to do?
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