It's a hard and very bitter pill to swallow when you realize that you weren't wanted for you, but merely for the things you could and did provide. I suspect they still feel 'wronged' from the living arrangement thing and see this (in their own entitled minds) as their due; you always gave a lot before, and you haven't lately, so this is something that they're 'owed'. So why should they bother to thank you for it? Auntie Roe always gave us stuff before, but she hasn't given us ANYTHING lately! It's about time she remembered us!
I have nephews like those. Disfunctional mother (yes, my own sister) and somewhat of a deadbeat dad who was a nice enough guy, but basically had two topics of conversation: bragging about whatever (winning at the casino was a popular one), or whining that they don't have money for whatever. It got tiring. Heard from one nephew once in the past several years, when he wanted me to cosign on a lease for an apartment for him and his girlfriend. I said that I couldn't do it, and was honest that it didn't make him look good when they didn't even know that their grandmother had died, and then he calls me, essentially for money, two months later. Guess what? I haven't heard from him since. I will be happy to establish contact if they want it, but it won't involve money.
At some point, you have to write them off, even though that sounds harsh. The relationship isn't there, at least on their side. It's too bad that they couldn't see what a good thing you were for them, and not just because of the money you doled out. But that's their lesson to learn.
And no, no more gifts.