Soulmate relationships are here to show humanity the lie of their separateness, and to shine light upon the lies that are told to support that division; for there is a certain vibration of truth between two soulmates that makes the lies too painful to ignore.
The truth of who each is to the other is not able to be suppressed enough to allow the egoic framework of lies to go unnoticed, their magnetic bond simply will not support it. With soulmates, the pain of the lie finally outweighs the pain of the truth, which will ultimately end their suffering.
Put another way, 3rd density relationships are built upon a foundation of lies, but soulmates can't hide the truth of who they are to each other; causing the pain of society's lies to finally outweigh the pain of hearing the truth. Soulmate relationships are restoring truth to our world.