Im sorry but as a buyer and as a seller. I think you totally jumped the gun with this. Sellers have lives and even jobs that can get in the way. Life happens. Also do you realize how much of a pain it is splitting up a auction? Of course he would ask it to be done that way with payment. Or he would have had to do what? Create a new auction with buy it now just for you? I have done that and its a pain in the butt. He could send you a paypal invoice. That works. Then after that he has to change the old listing removing the items that you wanted.

yes I believe he was trying to help you. And trying to make money. Thats why we sell. The need to sell sell sell so we can make as much as we can....and to cover the HUGE ebay and paypal fees.

But this is just my point of view. I may be totally wrong on this and your sellers motives. Hope it all works out for you both.