Is AUTHOR wrong in the post ? POST : Background: my girlfriend (27) and I (29) both vape the green in a legal state. Originally we shared one vape, but after a few times when one of us would go out and take it with, she suggested getting another one so we each had our own, and I agreed. We now have a matching pair.

She smokes at least 4 times as much/often as I do, which means she needs to buy cartridges more often. There's already been one or two occasions where she couldn't afford one and asked if she could borrow some of mine, and on those occasions I let her use mine, although it made me roll my eyes a bit as she had plenty of leaf she could have smoked. 

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Earlier today she found that drained her cartridge again and asked if she could borrow mine. I asked why she didn't just go get some from the store, and she said it was cold and she didn't want to walk right now. I said yes, but was grumbling about it, and we got into a small argument which ended with her saying that I was "making a thing out of this" and that if I didn't want her to use it, then I should just tell her no. 

I thought for a moment and said that I love her, and would prefer if she didn't use my vape. So she left to go get her own cartridge, after making it clear she's pretty upset and thinks I'm being ridiculous. She said she was not expecting me to think of the vapes as "mine" and "hers" in the first place... but I find that hard to believe because she made sure hers was her favorite color and uses that one exclusively (until it runs out, anyway).

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My position is that for something non-essential like smoking weed, "I don't want to walk to the store" is a pretty lame reason not to take care of things for yourself, and it feels like I'm basically just being tapped as an accessory for laziness.

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AITA?