AITA for declining a shift swap after my coworker covered for me last month?
AITA"You said you had an appointment," my coworker Finn said. "Then I saw you in the game chat all afternoon."
He'd asked me to work his Saturday shift so he could go to his cousin's birthday. I had the day off and wanted to stay home. Instead of saying that, I claimed I had an appointment.
Last month Finn covered a Saturday for me when I had a family lunch. I thanked him and said, "I'll owe you one." He took that to mean I would return a comparable favor when he asked.
This Saturday was the first free day I'd had in two weeks. I spent it playing an online game with mutual friends. Finn joined the chat after work and saw the messages from our afternoon session.
I told him I didn't think having a day off meant I was automatically available. He said he understood that, but I'd offered to repay the favor and then invented a reason not to.
I offered to cover a different Saturday. He says the birthday has already happened, so a later swap doesn't address why he couldn't rely on my answer this time.
I still wanted that day at home. The more I defend wanting it, the more I avoid explaining why I lied instead of discussing what I'd meant by owing him one. AITA for refusing the swap?