Your wife from another life is someone you could see you being married to in another life, and envisioning a healthy marriage.
Person 1: Man, I can see Julie being my wife from another life! She is so perfect, and we compliment each other very well!
Person 2: Lmao, I ship it.
Someone who envisions themselves with you but in this reality it would NEVER work, for practical reasons perhaps...
'' Eurgh, he was sooo hitting on me. I am his wife from another life''