Good friends and Semi-friends

Do you ever feel like once your semi-friends go onto the next level to become your good friends, there is a new void?  It seems like having a good crew of semi-friends is necessary too.  They are the ones that semi-interest you and yet you have not developed the bond to feel genuine care for their well-being.  They are almost like hook-up buddies in friend-form.  Sometimes these friendships are refreshingly low-stress and are a good outlet when you need to release some frustration.  Sometimes it gets hard to convey your frustrations in life with your bests because they are overly concerned and overly sympathetic for you.