I just happened to come across this:

Although Pitt and Oscar winner Jolie have been together for more than five years, the actor has said they will not marry until gay marriage is widely legalized. He is sticking to that.

"We'll get married when everyone can," Pitt told Parade.

If everyone could think like them. If only love was that simple. If only everyone can get marry. If only. Being human beings we tend to deviate from what we used to believe in initially. This is who we are.