Maybe bipolars attract each other: Dissection of a Relationship
We met because of our parents. Our our respective parents had met at church. He had a father and a step-mother. I had a mother and a step-father. Our parents went to the cafeteria together, played cards, and attended church functions. I thought the relationship as lovely because it kept my mother out of my hair.
That's not to give you the impression that she intervened in my life, but she almost did with some subjects and some situations. I was fully an adult, but an only child. Mom rescued me a lot. She frequently saved me from my own consequences.