The main reason God split each soul into two is to teach you coexistence.
As discussed in previous videos in this series, you now know that spirit world have 7 realms and once you reach Realm 7 Stage 9, you have to merge with your twin soul and become a whole soul.
Only then will you be allowed to progress to the next universe (fourth universe).
So United, twin souls, means twin souls that help each other grow spiritually, can achieve a great deal, but if one of them falters, then both suffer spiritually.
This may seem harsh and unfair, but it is actually to safeguard your spiritual progress.
No matter what, you have someone who will pray for you and try their level best to make you rise spiritually.