How can what's happening in the universe overall relate to why we love each other?
I began working on this issue in the fall of 1982 — starting with “life has to be cared for or it dies.”
Eventually, after understanding that caring is the common denominator of living beings, I had to go further -- does our caring nature relate to the nature of reality?
It does, through existing — see my blog post on January 1, 2018, for a long description of that.
https://discovery-solutions.net/blog/2017/12/30/from-the-universal-law-of-existing-to-mutually-caring-relationships
The Universal law of existing explains energy and fields, interacting and emerging, and everything that is existing.
Living beings continue existing because they are actively existing, actively caring for their continued existing; that's how we — and all living beings — are caring.
For us humans, that's how and why we are loving; we all have the need to be cared for and loved to continue existing, we all have the ability to be caring and loving.
From the cold hard reality of existing throughout the universe becomes the actively existing nature of living beings (wherever that is existing in universe), which becomes the warm loving embrace of caring to us.