What can I call him when he calls me boo?

Met a really awesome guy and we have great chemistry together. We've been on two dates but we've been talking for three to four weeks now.

Recently he started calling me "boo" in our texts and now I want to call him something like that too. And I don't wanna call him boo cause its kinda weird.

SERIOUS ANSWERS ONLY lol
What can I call him when he calls me boo?
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