Things I noticed...
He replies to my messages right away, and he is always sweet ( like keep warm or yes I can do this for you with pleasure).
He asked me out for lunch, and when we did, he kept asking me questions (do you have a boyfriend, where re you from... etc,
He did not want to leave when we had lunch, on the contrary, I told him we should go. Then he proposed coffee
When we were listenning to this song on the radio that I mentioned to like, he said "I will think of you each time I hear it"
He is got a girlfriend!! How should I translate this behavior?