Sneha- What you are describing is pretty normal. I have said the "you have a truck, I am going to be your friend" to my colleagues jokingly. There is nothing much to it other than a little humor. He seems like a nice guy but doesn't know how to communicate with someone he hardly knows. We all have days when we are chatty and the days when we don't want to talk. I would suggest keeping his number. Text him if you happen to move to his city or planning to be nearby to check if he is free and wants to hang out but you might want to stop texting just to know how he is doing or reduce the frequency to once in 3-4 months.