There were several important turning points in Riddle's life:
1. Receive Hogwarts Notice
2. Split Horcrux
3. Become Voldemort
4. Lost to the infant savior
5. Resurrection
6. Real death
However, if Riddle had not taken a different turn as planned when he was a child, then his fate...
CP:1V1, Brad Kasimov (original) x Tom Riddle