((((Jenn)))) I do not know the context or how it happened to come about, if I could take a wild guess, though, he probably just panicked because you did not return the sentiment. And when you asked him to clarify, it probably felt to him like he was being backed into a corner.
Also, after only dating one month, I would also venture to guess he meant he loves how he is when he is with you ( sort of like a mirror sentiment). And that you are loveable. He feels good when he is with you
Bottom line, follow your instincts