I feel so badly for you. It is hard to give up the "caregiver hat". I had to do the same thing in November, for my mother, who has osteoporosis. It was best for her (and for me, ultimately) to have her go into assisted living.
In your situation, I know it's different, but sometimes "helping" is "enabling".
A friend of mine complains all the time about how she has to buy her son's insulin (the insurance co-pay is $30), phone bill, and many of his groceries because he never has enough money. He is a journeyman electrician, making almost $40 an hour, not married, lives alone. Why doesn't he have money? He also uses drugs and smokes, and has money for that. I told her she is actually buying his drugs and his cigarettes, but of course she doesn't see it that way.
I know you will be fine, and your aunt will be taken care of.