You're not crazy, Mo. On the contrary, you're getting Very Sane Indeed.
It should be crazy, though! It should be the height of crazy to have to think such things of your loved one! But you know it isn't, and what does that tell you about him and your shared dynamic?!? Nothing good...
He lies and lies and lies. The smartest, SANEST thing you can do is not believe him. Even if he tells the truth about one thing, doesn't mean the next won't be a big fat whopper. And if you've grown [cynical] enough to know this in your core, who can blame you?