Soul something

Soulmate - is a term sometimes used to designate someone with whom one has a feeling of deep and natural affinity, friendship, love, intimacy, sexuality, spirituality and/or compatibility. A related concept is that of the twin flame or twin soul – which is thought to be the ultimate soulmate, the one and only other half of one's soul, for which all souls are driven to find and join. However, not everyone who uses these terms intends them to carry such mystical connotations.

Soul lovers – someone you love, and would do anything for, and someone who loves you, and would do anything for you. And in that love, nothing is required for either person, because everything is already given. You love them more than anything in the world and could not live without them.

Karmic soulmate – someone who has a special mission or influence on one's life
Scientific soulmate – (If) a relationship can be quantified, and scored according to an internal happiness scale. A scientific soulmate is the person with whom you are the absolute happiest. You would therefore be less happy with any other person in existence.