AITA for refusing to keep paying my boyfriend back when I already have fulfilled my obligation plus

During Covid I got behind on rent by about 12k. My boyfriend covered it. He is not just fine financially. He is well off to a level that feels almost silly compared to how hard I struggle every month.
When he paid the rent, the early plan was that I would pay him back once I got a lump sum I was expecting. But he also said something very specific that he now pretends never came out of his mouth. He told me, word for word, that if I paid him back in groceries or whatever, it counted. That was the arrangement. There was never a conversation about cash only. He never corrected anything. He watched me follow that agreement.

So for the next two years, I handled about 80 to 90 percent of our groceries, which averaged around 800 a month. I also paid for something we do together every month that cost anywhere from 400 to 800 depending on the month. So I was putting in roughly 1200 to 1600 a month.
Here is the part that hurts. Two years of that means I repaid between 28,800 on the low end and 38,400 on the high end. The original loan was 12,000. I paid him back more than double. Possibly more than triple. I was drowning financially while doing it, and he saw it every single month.
Now he claims none of that counts. He says repayment had to be cash. He denies ever saying groceries counted. He rewrites the entire agreement and acts like I am crazy for believing what he told me for two years. If he had said groceries did not count, I would not have done this. Nobody would.
He also refuses to celebrate any holidays with me. No birthday. No Christmas. No gifts. This has gone on for years. His excuse is that I still owe him money, while he sits in a completely different financial universe and watches me stress over every bill.
Any time I bring up the original agreement, he blows up. Full rage. No conversation. Denies everything.
So here is my question. AITA for refusing to keep paying for something I clearly already paid back many times over. Because from where I am sitting, this feels like a debt that does not exist anymore, and he is using it as a way to punish me.
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