I can't imagine any guy saying to his wife, "I love you. You're great. But you know, there are probably a good handful of people I've met in my life who I could have grown to love the way that I love you if I really got to know them. And there's probably many more people in this world who I could have grown to love the way I love you if I got to know them well enough. In fact, there are probably people in the world that I would be more compatible with than I am with you. You're great, but you're not the only one in this universe that is capable of providing me with what you provide me. That doesn't mean that I want to break up with you. I'm content with what you provide me, and I think that you're pretty good. The point is just that you probably aren't the best, and that you probably aren't the only one. Absolutes are rarely true."

I can't either, but not because those things are false.