Different people have different ideas of 'sweet', but for example, you can tell him you love him regularly, compliment him, and refer to him by pet names or terms of endearment (honey, sweetie, darling, etc.). Be sure to speak in a gentle, affectionate voice, and smile, as that can affect how your words come off. If he is still dissatisfied, he's probably the one with the problem. You can always ask him what he would like to hear, too.

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