He was going to claim a refund after the item has been sent then take your money and item.

He was asking me to send his item without a tracking number then tries to get refund.
If you ask to add a tracking number on the item, he rejects. This buyer also threat you with leaving negative feedback if you don't follow what this buyer says. Be extra careful sellers.

This buyer doesn't put his full name and phone number on eBay because he knows he will be dodgy to sellers.