I'm going to complain about my best friends distantness
Why are you going to complain about it?
I don't like them being away so much.
They should be with you every once and while. If they are always distant it is hard to maintain a friendship.
I'm not lonely, I just want to be friends with them again.
You friend might need some space, they could be going through some difficult times. Call/text or see them and ask them what is going on in their life at the moment. You could help them through it and reconnect as friends.