You shouldn't hang around someone's house when they aren't home.
Johnny drives over to Steves apartment but Steve is not home when Johnny arrives.
Johnny wants to make sure than himself and Steve see each other that day.
Johnny texts Steve saying that he is in the area and grabs lunch at a cafe while he waits for his reply.
Johnny notices that the door is unlocked, so he goes inside to wait until Steve comes back.
Steve texts Johnny back a few minutes later, says that he is back home and that Johnny can come by anytime.
Steve thinks that someone has broken in when he gets back and calls the police to investigate.