TL;DR best friend gets mad at me every time she sees I’m at this girls house she doesn’t like. She claims the girl stole from her when really the girl just didn’t pay her back. Aita for not seeing it the way my best friend does?

Almost two years ago before my best friend (X) and I were even close, she was good friends with this other girl (Y). Back then, I wasn’t close with either one of them, just acquaintances.

This is from X’s POV: At that time Y was going through some hardships. [I believe] she got kicked out of her familys house and was living with her boyfriend, I don’t think she had a job. X &amp; Y were hanging out and X offered Y $100 because she was behind on rent. (I can’t remember if Y asked for it or not). Y accepted it and said she would pay X back. Weeks pass and X is asking Y back for the money and Y is basically saying she doesn’t have it. Months pass, X starts getting aggressive and messaging Y’s family saying Y stole $100 from her. X starts telling everyone Y stole $100 from her. One day X runs into Y in public and starts going off about the $100. At this point X and I are very close, but she’s been getting upset with me because I’be been associating with Y lately. 

I only associate with Y because one of my good friends is roommates with her. Whenever I go over to see my friend she’s always around. We all drink together but most of the time there’s several people in the room and I hardly talk to her. Twice I’ve tried to talk to Y about the incident and see if I can help X out. The first time I brought it up she told me her POV which was the only reason X gave her the money was for coke. I didn’t care for the reason, I still just asked her to pay it back. She said no. Another time X was pissed at me so I messaged Y again just asking if she can at least say sorry and show remorse. Y refused.

I’m kind of torn because
1) that’s not my definition of stealing. To me, stealing is taking without permission.
2) why would X give a person with no job $100?
3) back then, they were all indulged in coke and loose behavior, I personally don’t take promises from anyone like that.
4) I was taught to only make offers I can afford to lose because not everyone keeps their word of paying you back. If I have $20 i can only *afford* to give you $5, why would I give you my only $20?

Personally, I think X just needs to take this L and learn from it. It’s running on two years now. I understand it’s the principal but X has a lot of money already, she’s definitely not struggling. But then again neither is Y anymore. She still doesn’t live with her family but they’re on good terms. Y comes from an extremely wealthy family where $100 is a grain of sand to their wallet. AITA for not seeing it the way my best friend does?