You are:

The Dean to my Cas

The Sherlock to my John

The Doctor to my Rose; The Rory to my Amy

The Ianto to my Jack

The Four to my Tris

The Peeta to my Katniss; Finnick to my Annie

The Harry to my Ginny

The Alec to my Magnus


In other words:

I’ll fall for you

I’ll believe in you

I’ll tear through time and space for you

I’ll always come back for you

I’ll fight for you

I’ll be lost without you

I’ll wait for you

I’ll always need your strength