There's no way to talk about fate without sounding pretentious, but I will try.
You were exactly what I needed precisely when I needed it.
I needed you to be far away so I could nourish my independence and learn how to love something without touching it. Because no one taught me you don't have to touch everything you hold dearly. Sometimes the things we love have to remain under glass cases.
And sometimes to touch something is to hurt it.
I needed you to not need me as much as I needed you.
I needed you to ignore my advances.
I needed you to be snarky.
I needed you to have brown hair and eyes the size of saucers.
I needed you to have an affinity for otters
So you could tell me that thing about how they hold hands so they don't drift apart.

I don't know how to end this poem, but I will try.
It was you in the red sweater with the white birds.
It was your neutral expression.
It was that you were up late and willing to chat.
These are the things that made you the exception.