Whenever an argument or dispute occurs between the rival and me, deep down and secretly you take his side.

Here, the lover exposes the quiet heartbreak of noticing where the beloved's true loyalty lies. Whenever an argument breaks out between the lover and the rival, the beloved might remain outwardly calm, but 'behind the veil' of discretion, their heart secretly leans toward the rival. It captures that tender ache of realizing that no matter how much you plead your case, the one you love has already quietly taken someone else's side.