So, after much consideration, I will NOT be buying any new Betta now, or when my (now) only Betta passes on.
I've also decided to sell all of my fish tanks, heaters, gravel, etc etc.
The reason for this is because I only have a year and then I am off to university. I will be living cheaply with someone else, and I would like to be spending low money on food, electricity etc, and fish tanks can use quite a bit of power, and money. So I will not be having them during Uni.
I, however, have trusted within myself to start again once I finish Uni. Fish-keeping is one of my only true hobbies that I enjoy. I will not give it up that easy!
I will be (hopefully) starting fish-keeping again after Uni, but what fish it is, I don't know. I want a big aquarium..