is this true..? or is this your assumption?
i said "probably" it's a theory
wasnt there another yaoi like this? uke gets into a car accident when after he goes to seme's wedding, uke's soul goes back in time when they were in highschool, seme has a power where he can see spirits and they both fall in love. after the uke's soul comes back to the present time it shown that he and seme are married for a long time
yes i vaguely remember a few mangas with similar plots lol
his soul after jumping off the train track probably traveled back in time to when he was in high school that's why he has no memory of what happened at that period of time it was his adult self that was in his body and his teenage self/soul might be stuck in his future body that is in a coma or something