My brother-in-law, who is a die-hard Dallas fan, has really helped me with this. Watching how crushed and emotional he gets after Dallas loses, (He's had a lot of opportunities in the past 4 - 5 years), made me realize how silly that behavior can be. It's to the point where his family dreads Sunday evenings.
My love for the Panthers has not diminshed at all. I just try to take a more positive stance going in. I cannot control how they play, how the coaches game plan, or even how the Refs call the game. I can cheer and holler and have fun during the game. I can also really enjoy the Wins. If the outcome is different than I want, I do have a period where I am down, but I try to find positives to hang on to.