Well I put him in the freezer yesterday, about this time. But I read somewhere that fish can come back to life after being frozen and the defrosted. So I'm kinda worried that if I bury him in his ice cube in the ground that he'll come back to life and suffer more because he won't be in the water, he'll be in the ground.
Because bettas are cold blooded, they can occasionally come back to life after being frozen pretty much solid for a small bit. This is because their metabolism slows, though there is a chance it won't stop. If you freeze him solid long enough, he's definately dead. There are only a few species of cold blooded animals that can survive being frozen solid for extended periods of time, bettas are *not* one of them.