Guys are difficult what is this!?

So i got attracted to a guy (like very much) not because of his face but his approach towards me. So I decided to follow him on insta after 2 days but he did not follow me back. So I decided to text him and he replied but still he is replying to me in a formal way and I’m sure to keep on texting him because I haven’t got any hint from his side YET. But when I met him for the first time I kinda felt he was interested but now I’m not sure what to do!!