That is called aging. At some point you just realize, through the course of life, there are real things that matter. The entire NFL is pure entertainment, like a movie. You going to go home moping because they killed Joe Pesci in Casino? 3 days later you still upset about seeing him in that grave in the middle of the desert? Have a kid die (I havent) get a divorce(I havent)... but have real stuff happen to you over time, and the Cowboys quickly take their place in importance.
I remember my girls being upset about losing the championship game of a tournament. It was around the time we started dropping bombs after 9/11. I made my personal rule on that day. I said they had 1 hour to be upset, but then we move on. I was telling them there could be people dying in the middle east right now, and we are going to cry about losing this amazing game? Nah, cmon ladies, lets have some perspective.
I didnt always follow my own rules, but I got better over time. Same with the Cowboys.