Lyric discussion by soulglowactivatur 

Cover art for But I Do lyrics by Now, Now Every Children

yes most definitely agree with both above comments

the last part of the lyrics "I am what you need when you can't find it somewhere else. I am what you want when you don't want anything else." is saying that the other person in the relationship isn't interested in them until they can't find anyone else so they keep taking them back and ultimately fucking with their heart, you know

My Opinion