Lyric discussion by Ligufi 

Cover art for I Am You lyrics by Depeche Mode

It's about experience so much love that it hurts in the very depth of your soul. Knowing you have the one thing in life that makes you complete, your other half, the one you want to share everything with. This feeling might be quite frightening, making you feel you don't deserve this greatness, awhich explain the melancholy feel to the beat and lyrics.

Many probably interpret this song as wanting to get free from a relationship though.