Do I have a right to ask him?

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I have this friend from the chat room, who became my constant chatmate and caller. He works in the U.S. and me in the Philippines. He calls me up during his break time (between 2 -4 pm) and another call at night from 10 pm to 3 am at most. That was a call routine of his other than chatting online. We talk so much about everything and even share laughters. He would always remind me of taking my daily habits and say he cares, that's why. After 10 days with such routine, he did not call me up nor go online for three days. Until on the 4th day he called me up and said, "I called u up because I missed you". I asked him why he suddenly not calling me up and never goes online, but he just answered nothing and said it is secret for now. I continued asking him why he sounded like so sad, and he just said, "you'll know why when the right time comes. After that call, he promised to call me up again at night. And the next day, I had a missed calls because I was then taking a bath. We now talk a little. From the usual long hours to minutes. I did ask him if there is something wrong and again he just said it's secret. Lately, he was acting so strange and am concerned. I recall him saying "he loves you" and I had no idea whom he is referring to as "he". When I asked him "who loves me" then he suddenly jokes me "your boyfriend". He knows that I do have a boyfriend. But, am sure that isn't the real issue. Last night he never called me up even this afternoon. Am anticipating he will call me up tonight and ask again if there is something wrong. Do you think am overacting or overassuming that there is something wrong?