Quiz - last time I checked, I was a bloke, but strange things can happen!
Maybe I'm missing something. Am I right in saying this guy doesn't want to SEE you, but wants your understanding and time, and to keep in contact (presumably by text or email)?
We're all different. I can't know what's going on in his head but I find someone saying he's scared of losing you after one date very odd. If a woman did that to me I'd probably back away sharpish. It's a bit bunny boilerish. Even if you really liked someone strongly when you first meet them, scared of losing them is very odd.
As to what he's doing? Assuming he isn't very odd as I fear, the most obvious answer I can think of is that he might have someone else on the go and by keeping in touch with you he's giving himself a back-up if it falls through with the other person.
I've been known to be a sensitive bloke. This just smells fishy or odd. Like to be wrong, of course.
Others may have other useful thoughts. But I'd continue radio silence. You want to DATE someone, I assume, and SEE them, not have a penfriend?