AITA?

Heres a little backstory,

my brother and i were adopted by another family member, we went through foster care only having each other. He is 8 years older than i am. i am 19 now, he is 27. 

my parents kicked him out for the last time when i was 13 and he was 21, because he wouldnt stop smoking weed, disobeying, and he could not hold a job down even though my parents got him multiple jobs.

he went to Waco, where my mother who gave us up lives (i was adopted due to drugs and theft at the age of 5, therefore i hate her and have no reason to respect his decision) and he got into some pretty hard drugs. he called me maybe once a month, and i respect that because i know he truly cares for me but cannot get out of the lifestyle he is in. time went on, i turned 18 and moved out of my parents house due to complications, he figured this out and began messaging me over facebook, as he was not allowed to while i was living with my family, because they did not want me to have any connections with my previous scumbag mother other than one call a month under their supervision. anyway, i was ok with him messaging me, but soon the messages stopped, i didnt think much of it, as he doesnt have much money and i assumed he didnt pay his phone bill. i get a text from my mom while at work, and she sent me a picture of his mugshot, and she told me he was in jail for stealing from a disabled woman he was taking care of. 

about a month later i get a message from him, i didnt even read it, i went on a rant and ripped him a new one as best i could through text, calling him all sorts of names, because what kind of person steals from a disabled lady? or anyone for that matter...

anyways... he apologized, said he was with a new girl that he loved very much, had a job, and they shared an apartment. he asked me for 20$ one day because they needed gas money, i had to turn him down because i had just paid a bill and didnt have more than 15$ on my debit.

about three months later he is saying that he is having trouble with groceries... he asked for money again, this time i was in a good position, had all my bills paid for the month and decided i had about 120$ to spare for my older brother. However... there was NO WAY IN HELL i was just going to transfer a drug addict 120$. mostly because i didnt want him to OD, but another reason is that i wanted my hard earned money to go to a good place...so i made him an order on HEB curbside, picked out all of his groceries, got some toiletries... it was a huge order, mainly because i got all the cheap stuff, but that shouldnt matter. i set the pickup time for the next day, i called the ladies in curbside and told them not to give it to anyone other than him, he got the order, thanked me, and all was good. 

fast forward to mid december, he texts me saying he needed 30$ to open an account and unlock his credit card, and he will transfer me 100$ back as a thank you for the groceries. i decided this ONE time i would transfer him money. 

i wait two days, and ask him where my part is, or at least my 30$ back because insurance was due...no response.

a day later... no response.

finally he hits me with "yeah i dont know, i called, they said they would get back with me monday" 

i may be 19, but i am not stupid. the last thing i said to him was "dont worry about the 30$, even though you probably never were, dont ask me for help ever again"

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AITA? he wished me a happy birthday and apologized, i have him a "thanks" and refuse to message him back. 

what kind of man asks his 19 year old sister for financial help, knowing that i am the last one in the family that will even talk to him, then screws me over???

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TL;DR brother is a loser with an addiction and asks me, his younger sister, for constant help, and eventually screws me over just like the rest of the family. 