I know a middle-aged man who is much older than me, and his son is the same age as me. Since I met him, I often think of this person. I am male, 21 years old. I do not know if it is simple?

I am a Chinese and he is a Moscow man. I have known him for more than a year. I used to call him Sir, but now I call him Uncle. Since we met in Beijing, he has been close to me, such as giving me hugs and he put his arm round me when taking photos. I have never experienced these before. I always think of this person and even want him to be my godfather. I don't know how to evaluate this emotion.