People say that in What If Episode 4 that its Nexus Event plot is Christine’s death!! But I think we should thought of what make her death, in other words, the Nexus Event IS Christine and Strange staying a couple!! As in the first Doctor Strange movie, as seen in the Sacred Timeline, they had broke up sometime ago! So, in the movie, by already breaking up with her, Strange saved her life as she wasn’t in the car when the accident happened!!