John/Jane blames the stranger for ruining her life and would kill him in a heartbeat if possible.
Why does she blame him?
Is it for having sex with her?
That fling did require consent of both of them, so if there is anyone to blame, its both of them.
Or is it because the stranger got her pregnant?
Again, its mentioned she excelled in academics so I assume she'd have the basic knowledge of biology to understand one can become pregnant after having sex without protection, so if there is anyone to blame, its both of them.
Or is it because the stranger left her?
Can she not think of a scenario e.g. he got hit by a car and died?
Lets say she thinks he left her. How is that life ruining? She liked someone, had sex, and he left. How did the leaving ruin her life?