The end of love?

Recently I saw that a couple that was married for 5 years, filed for divorce. I was shocked. I was speechless. They looked so perfect for each other and now they discover they aren't compatible? After 5 years of marriage? It makes me wonder. If they split up after all they have been through, what is the difference with my relationship? I have been with my boyfriend for almost 3 years now. What if the same happens to us? Did we wast our time? Is it worth all the pain we will cause? We are going through some hard times now, with school and the holidays we aren't spending together. I fear we aren't going to survive this. I know we can, but will it happen?