Lyric discussion by danaxdrugface 

Cover art for Blue Eyes lyrics by Within Temptation

this is just my first thought on it. but I believe that this song is about someone who was happy, and loving [the first and second lines], who fell into the arms of someone controlling [hence the chains].

with the controlling behavior, and what-not, theyre becoming cold, and angry inside [from the "its burning me up inside" through the rest of the song].

the eyes arent bright and loving anymore. they are filled with dull anger and sorrow.

thats my take on it anyhow