Lyric discussion by LightsOut 

Cover art for All Love lyrics by Ingrid Michaelson

I don't think it's about a dysfunctional relationship working, I think it's like the guy treats her poorly but she can't help but love him. And "it's all love" is about the guy kind of writing it off like it's nothing. She recognizes that it's stupid and wants to be done with it but she still loves him.