If a guy says "I've never met anyone like you" what EXACTLY does that mean?

It can really vary.
for example, it may be certain things making an amazing package.
confidence, intelligence, her own person, individuality, with small boobs, tattoos and piercings, lovely to chat to, someone you can click with.
also they may have similar history to yourself or events on your mutual past.
It can also be hugely negative when you meet someone toxic or who is a bigot and you are like ‘wow never met anyone like you before’
so the range can be hugely positive to negative
We need more contextual information. Did he say it with a smile? Does he want to get back together? Does he avoid you? Context is your answer here.
He said it over text and we're not dating, just talking
Opinion
2Opinion
You can't tell tone over text. So...
it means he's never met anyone like you
go AWAY
Superb Opinion