AITA, I bought my gf a spa membership?

So, we have 7 kids together. She's a sahm and i work 2 jobs. We were having a lunch discussion the other day about how she never gets out and needs her own time, but she couldn't think of anything to do. So, being the idiot bf I am, I went and signed her up for a spa membership with my HSA card. I pay for it, they take it, why not?

"Oh, okay, cool" was the response. "Uh, I don't know what I want to do, but it isn't that..."

We can't go on dates, we don't have any time to spend alone together and apparently, she just wants to do literally nothing.

This actually causes quite the argument last night. We don't have much, but am i being the asshole ?