There are two people. Gordon and Billy.
Billy is giving Gordon a lift regularly. That's fine and Billy doesn't mind at all under the circumstances. Without going into it all it's a reasonably arrangement.
But when Billy goes to pick Gordon up Billy texts Gordon just as he's leaving to say "on way". It's a 2 minute drive away.
When Billy arrives, he's having to wait several minutes for Gordon to come out to the car and is getting annoyed.
Gordon says that Billy should text again to say that he's there, but Billy thinks as he's helping Gordon, that Gordon should be ready and waiting at the door.
Who is bu?