Accepted offer from lovely young couple at full asking price. A lady also offered full price, but I thought the couple were keener and I really liked them so chose them (neither would go higher at the time). Today the lady offered 50k extra. So conflicted now, don’t want to let the lovely couple down, but - 50k! Don’t want to go back on my word, but - 50k! Would prefer to see the couple living in my house, but - 50k! Would I be an awful arsehole if I accept the higher offer now? What would you do?