Question: how to know if a guy likes you but hiding it?
Answer: 21 Giveaway Signs a Guy Likes You.
He initiates. A guy is never going to repeatedly strike up conversations with a girl he's not interested in. ... 
He's always around. ... 
He always texts you back. ... 
He remembers the details. ... 
He's nervous around you. ... 
He grooms himself. ... 
He follows your social media accounts … and pays close attention.