Gorgeous bettas!
I've had them on and off for years. Long ago had a 50 gallon tank on a stand over a 30 gallon tank. Large mix of fish on top and two male bettas and several females. Guess with that size tank they stayed apart on their own. Let the bottom tank overgrow and put in a male and female and watched the process of bubble nest building and the male wrapping around the female, she dropped a few eggs, he caught them up in his mouth and put in the nest. So fascinating. Ended up with 5.
Since then have had singles but am sure I did not get good quality fish or "old" fish. Did not have much luck keeping them more than a year. Maybe you could give me some hints of where to get one and caring for a single.