I agree that it is about a failing relationship, but the details, as I interpret them, are different. The narrator is doubting his/her partner in the first verse: "Something that you have said or implied makes me doubt you" This is happening more and more frequently: "Why is it every time I think about you"
I think the 2nd verse relates to the first. The singer's doubt of his/her partner might just be paranoia but the ghost (probably of an ex that was unfaithful or untrustable) is something that the singer believes in anyway and wishes that he/she could get rid of, but needs the help of the other to disprove it's existence.
I agree that it is about a failing relationship, but the details, as I interpret them, are different. The narrator is doubting his/her partner in the first verse: "Something that you have said or implied makes me doubt you" This is happening more and more frequently: "Why is it every time I think about you"
I think the 2nd verse relates to the first. The singer's doubt of his/her partner might just be paranoia but the ghost (probably of an ex that was unfaithful or untrustable) is something that the singer believes in anyway and wishes that he/she could get rid of, but needs the help of the other to disprove it's existence.