Dear Thelma: Why doesn't he pick up?

I’ve known this guy R for more than a year. We have been pretty close and had numerous conversations. I used to have a crush on him but never pursued it. As we became closer, I realised that his actions and words somehow indicated that he had feelings for me too.

Just recently, about a week back, he confessed to me. I was really happy about it. I was supposed to call him that night and have a proper talk about our feelings for each other. But when I called, he didn’t respond so well.