Connection to another person....

[Patrick]

...
A soul family member isn't one that offers a smooth trip. They offer suffering, for this provides the opportunity to accelerate ones spiritual evolution. How much suffering depends on what is to be learned.
...
My greatest loves have also provided me with my greatest sufferings. It is part of the nature of being human.

I can attest to this too. It's even fairly easy to notice the magical nature of the catalysts you get from such relationships. It's possible to glimpse the patterns.