Since sellers cannot leave negative feedback on ebay I would be clicking the buy it now option for everything he put on ebay....at least until he blocks you. Cause the a-hole some hassle..........
I would leave him negative feedback since the link is still up and you haven't left any. That would hurt him worse than anything else at this point. Just be careful what you post and don't use PayPal or eBay in the feedback or it could get removed if he complains.
One negative will put his percentage under 90% and buyers will check out why.