You.

I never really understood this, 

You were my "person" , meaning that i'm in love you with you, wantint you

You are in love with another person, wanting them 

My heart used to skip a few beats because of you

Now- it aches and I can't tell the difference between love and hate.

The way you made me feel was magic; I would follow you to hell to get my fix

You drained me of everything I had.