What does it mean when a guy always leans in?

OK so there is this guy and I don't know him that well...however, since the time he met me and we first talked he would always lean in and get close when we are talking...almost like he cannot hear me (that's what it looks like)...he even does it when the room is quiet. anyway, could this mean that he likes me or is 'attracted' to me or is he just trying to be very polite and a good listener?
What does it mean when a guy always leans in?
Post Opinion