It was 5.15am on Tuesday and Eline van Duuren was waiting for her boyfriend of 4Â½ years to start his car.
She had said her goodbyes to Luke Wales, 28, who was getting into his Nissan Pathfinder four-wheel-drive to go to the airport for a short surfing trip to Bali.
"But then he came back a second time," Ms van Duuren told Seven News yesterday.
"I don't know for what reason, he switched on the lights, he must have forgotten something . . . so he gave me another kiss and I gave him another hug and then he left."
Forty-five minutes later, the fly-in, fly-out worker was killed instantly when a Toyota Avensis driven by Glenn Griffiths Carter, 56, crossed the bush median strip on Roe Highway from the westbound lanes and hit Mr Wales' vehicle head-on.
The death has left a huge hole in the tight-knit Wales family.
Mr Wales' sister Caitlin told Seven News she read about the accident online without realising the young driver was her brother.
Ms Wales said her brother always made her laugh and she did not know what she would do without him. "He touched so many hearts, he's going to be missed," she said.
"I always thought he was the funniest guy ever and if I was ever going to meet someone, I wanted him to be like my brother.
"He was the nicest, nicest guy. Everybody loved him. I miss him so much."
She said his family and friends would remember him as a caring, funny and friendly guy.
He had been studying to become a history teacher but was working in WA's north to save money so he and Ms van Duuren could buy a house.
When Mr Wales returned to Perth on Monday after work, Ms van Duuren took the day off to spend time with him. She said she would cherish that day always.
"He's my best friend. I'm just going to miss him a lot. It hasn't really sunk in yet," she said.
Police hope autopsy results will shed some light on on why Mr Carter, who also died, lost control of his car.
Major crash investigators want to speak to anyone who saw the Toyota before the accident.
Police believe the Toyota was among several cars and a truck before it began to swerve across the median strip.