Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/Sensitive_Button_936 on 2023-06-26 13:58:03+00:00.

I (26f) and my bf (27m) just got into a heated argument about his mothers lights being cut out this week due to late payments. His mom is short on her light bill because she decided to take over half of her bill money and spend it on other things. She is now expecting us to cover the cost. She claims she will pay us back this Friday but she has never paid back a full payment. One time we loaned her $100 and she only gave back $60 in turn making us short on our own bill. My bf is furious that I would want his mom to be without lights and that I don’t care. I would like to further explain why I don’t particularly care about her lights being out. Firstly she spends money on unimportant things like weed and cigarettes and sells her food stamps during the month so there’s that. Secondly when me and my bf split up about 2 years ago she was our babysitter while we both worked. (mainly mine bc our child lived full time with me) She would constantly say she couldn’t watch him making me quit about 4 jobs bc she couldn’t handle him (he was such a good baby though). So my uncaring comes from a place of resentment. She didn’t care that I had a child and bills so why should I care about her lights being out for maybe 2 dats. AITA?