I'm just so astonished what's the point in this transaction

Basically the story is the buyer reached out to me for some gojo sunglasses bag keychain and offered $10 and I was like sure. I sent a listing and put in $30 as the price and told him to offer $10 and I'll accept and I accepted and said I'll ship it the next day it was 11:30 pm for me. The next morning he changes his mind and I'm like sure I can cancel and then after I cancel sends in an offer again and then once I accept asks me to cancel and then once I cancelled he wants me to give him another chance 😭😭I'm so confused and was slightly infuriating to waste my time on this