Last week my boyfriend and I got into it and I just wanted to know AITA for it:

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One consistent issue we have is him making what I feel are unilateral decisions about our finances. We've had this discussion a few times over the last 4 years.

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About a week ago, we had a discussion about how tight money was going to be this month because both of our incomes were going to be about 1/4 less than normal. I brought something up that I thought we needed and it was decided we wouldn't spend the money on it.

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That same day, we both needed oil changes and we headed off to the shop to go get them done. In the car he told me he got a package (a card with 3 oil changes and 1 free) that would cost X amount of money and could he use my card to pay for it. I said fine and he went in to pay for it. I get a notification on my phone after he swipes and it ended up costing Z amount, which was almost double what we discussed.

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The argument came about because we had JUST discussed not spending large amounts of money unnecessarily this month. I told him I was angry that 1) He didn't let me know before spending that amount of money on something and 2) He spent that amount of money on something that we didn't ACTUALLY need.

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He says he was wrong for not letting me know (while also saying he would have just used his own money if I had said no), but said he wasn't in the wrong for spending money that we really don't have on something we wouldn't need (at least not for another 3 months when our income would go back up) especially since just hours before we decided not to spend money on something that we did actually need.

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AITA for being irritated at the course of events? 

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TL/DR: BF spent almost double what we discussed for something we won't need for 3 months after having a discussion about not spending money on things we won't need.

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