Great buyer to deal with! Recommended

Worst buyer ever, time waster. Made offer, offer accepted and paid. Found the item he wanted from a friend and made a deal but he want to change some previous item.Asked him a million times you please confirm what you need before you pay,still ends up like this. Asked a million times stock availability but don't want to pay say will pay next week. So how many times I need to check stock availability? Totally absurd and. In the end ask for my friend's contact. If you still want this why back out?