What is he calls me sweetie what should i call him?

If someone calls you sweetie, it's a term of endearment that can signify affection or friendship. It's usually a casual term, and can be used by someone you're close to, or someone you've just met.

As for what you should call him, it depends on your relationship with him and what you feel comfortable calling him. You could use a similar term of endearment, such as honey or darling. Alternatively, you could choose a nickname or use his first name. Ultimately, the name you choose should feel natural and appropriate for your relationship.