Your own, personal, private name for him? There are many options like sweetums, or sug(ar), or cookie. Sexy of course, but not in public! Use his middle name if no one else does, or maybe you could ask him his "family" name. This would let you inside his world and be much more special than something made up.
Popular nicknames for a boyfriend is pooky, boo, beau and lover.
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Baby, babe, honey, hun, sweetie, cuddy buddy, teddy bear, daddy, snicker doodle, lollipop
Some good boyfriend nicknames could include "Love", "Babe", "Sweetheart", or "Honey". Choose a nickname that feels natural and affectionate to both of you.