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Are you really serious?
1. He knows your IP address because Skype shows him your IP address when you're in contact with him
EDIT: Here's how he finds your IP address: http://blog.hcstation.com/2012/06/how-to-find-ip-address-of-someone-via.html /EDIT
2. IP addresses are just addresses. That threat is about as serious as someone threatening to disconnect your phone because they know your phone number.
Ask your internet service provider if you have a static or dyanmic IP address. If it's dynamic then turn your router off, go out and eat at Whataburger, come back and turn your router back on. You'll have a new different IP address.
Then never 'talk' to that person again.
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