in my opinion it's the opposite- not a new relationship but one that is starting to die out. as the unnamed guy is the "closest thing [she] know[s] to love", she sticks with him, but still, "time's a-wasting", and she's wondering if it might be better to leave him now when they both are in a b;ah mood about the relationship than later, when she could have a broken heart. meanwhile, they never discussed this tension, thus the name of the song. it's sort of a warning that she may just leave, because the relationship lost it's special je-ne-sais-quoi.
in my opinion it's the opposite- not a new relationship but one that is starting to die out. as the unnamed guy is the "closest thing [she] know[s] to love", she sticks with him, but still, "time's a-wasting", and she's wondering if it might be better to leave him now when they both are in a b;ah mood about the relationship than later, when she could have a broken heart. meanwhile, they never discussed this tension, thus the name of the song. it's sort of a warning that she may just leave, because the relationship lost it's special je-ne-sais-quoi.