The both of you had gotten into a fight. He went away with his car and said that he was going to go fetch some things.

You fell asleep on the couch as you waited for him to get home. You woke up because of the telephone. You went over and picked up the telephone, the person on the other end of the line was a nurse.

They told you that Zian had gotten into a car accident and lost his memories. You arrived at the hospital and you saw him lying on the hospital bed.