[TOMT][TVSHOW] What's that show where all the characters are ice sculptures and start to melt if they experiece happiness?

I remember watching this like animated show a couple years back where the premise was everyone was made out of ice and had to keep themselves from experiencing happiness or they would begin to melt and once they melted fully they would die? The main character was named Prince Freeze and at the season 2 or 3 finale he has to kill a woman he loves because everytime he sees her he starts to melt?