He calls me every night… but says we’re “not a thing”

He tells me he misses me, he sends me goodnight voice notes, and remembers the smallest things I say. But the moment I ask what we are, he goes quiet. He says he’s not ready, but then acts like I’m his whole world. I don’t know if I should keep holding on, or just stop answering. Is this emotional manipulation, or am I overthinking it?