Salem is still just a baby and he views you as his mommy. He's been through a lot in his short life and you are the one who is giving him all his care. Of course he wants you to be there 24/7.
He will probably always be a really loving cat, but he'll probably get less clingy when he gets older. Just like real kids, enjoy his babyhood while you can. It won't be too long before you call him and his response is "I'm doing something right now - I'll get back to you."