Physics of love
Reality seems to be like an infinitely large choose your own adventure book. It has already all been written, the past and future are already set. But within it there are near infinite choices to be made. Our consciousness has its own timeline going through this storybook, a story within the large story. And we are all doing following our choices and occasionally we cross paths and connect with each other, and the recognition of that connection creates love. We find someone in this infinite clash of choices and we find we are for a moment on the same page.
It is like when you go hiking in the woods it is very natural to say hello to the other hikers you pass. You may see them again or you may not but it becomes very natural to say hello to them. And for a short moment, there is a small instance of love.