Is this guy interested in me?

My father sometimes goes to the US for work and the last time we went there together. When we were there my father introduced me a guy and his father he was my fathers friend. We had a nice conversation there and I came back to my own country couple days later. We got each other's number for something. Then he started chatting with me since that day like for a month. It's more like friendly but he writes every day. how do i know if he is interested in me? My English is not great sorry for the mistakes.

Is this guy interested in me?
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