Nicknames are not someone we can create for you, especially for someone you have a relationship with. Nicknames are personal and spontaneous. Without knowing you, your boyfriend, and every single aspect of your relationship, it would be impossible.
If you cannot think of a nickname, then leave it. The success of a relationship does not depend on what cheesy name you call your other when in each others company.
A nickname should not be thought of, but instead be natural.
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