Haven't Heard From Latest Chemistry Guy

The latest guy I met on chemistry wrote me back and said that he had a good time with me and wanted to see me again. Which was very nice and surprising. I liked him, but didn't think we had that much chemistry, but I would certainly be interested in seeing him again. I wrote back and said I would like to get together again too. He sent me his phone number again. I wrote back after a day and said I would love to get together or talk. Haven't heard anything. Surely he would get the message that I want him to call me???? He seems awfully busy with his new job. So I am not hopeful at this point.