Letters to the Editor
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You're not married or living together
You are not married or living together. You're dating, and occasionally spending time at his apartment.
He clearly does not want to live with you or marry you. Maybe he will some day; maybe not. But right now he sees you two as dating. You don't get a key when you're dating. He knows that giving you a key is essentially saying he wants you to live there.
He's not being an jerk. He's dating you, possibly exclusively, possibly not, but he does not want to live with you. It's up to you to decide if that is enough for you.

