Thats exactly what I was thinking. Someone is stalking the legitimate bidder.

Id block him and then contact him and ask what they think they are doing (really nicely). Tell them him youre asking because his bidding behaviour looks like a possible stalking cyber crime, and you know that couldnt possibly be the case, therefore youve asked Ebay to investigate for his benefit, to clear his ID.

Or you could keep out of it and just block him.

But I wouldnt be able to resist. Lol