Just tell him. If you can't tell someone about your speech disorder without them getting actually mad at you, then that says to me that they're not ready for marriage. But chances are, you're overthinking it. I think we can probably give this guy credit that he isn't stupid. He probably knows you stutter, or at the very least, have a speech problem that isn't totally normal. Which means he probably knows your excuses for it are bullshit. Which means he's been playing along all this time, without any outward judgement or negativity. Which means he's probably just doesn't want to see you embarrassed or upset. He'd rather you lie to him badly. That's a good apple. And he deserves your honesty, not because he doesn't already know, but because an important part of being in a relationship is to let someone really *know* you. He will never be able to totally *know* you until you're open with him about this. Good luck!