[Kisses him for a long moment, lingering close, but eventually does pull back enough to press their foreheads together again, hands cupping his cheeks gently]
... I know what you mean, though. Even if... you know how someone feels, and you don't doubt their feelings -- you can't help but feel... [as if they'd prefer someone else, instead. That now that they have someone else, they don't need you.]
[...] [Brushes his thumbs over his cheeks gently] But, Merlin... I never doubt that you love me. You don't have to worry about that.