I mean it when I say that I believe honesty is the most important thing in any relationship - romantic or not. I think it's actually very necessary for you to tell him about the psychology of your stutter. You mentioned how he's not very empathetic, in which case you should explain it to him in a more "scientific", analytical way, more than an emotional way. Explain to him what happens in your brain when you stutter, and why it makes you uncomfortable/upset when he teases. At the end is where you should mention it hurts your feelings. Also from what I can tell about the jokes you mentioned, I don't believe he is making fun of your stutter itself. My girlfriend would always laugh at the way my stutter sounded. I get it, my stutter sounds funny. I had to remember that she wasn't laughing *at the fact I have a stutter* that I can't help, but only at the *way it sounded*. The subject of the joke isn't always the target. The subject was my stutter, but the actual joke was targeted at the way it sounded. If she had said "haha ur so stupid *because* u have a stutter", THEN I'm gonna get pissed. She can have empathy for my problem but still laugh at a funny sounding stutter. But of course that's just me - if someone joking about your stutter in any capacity makes you uncomfortable or insecure, than you definitely should tell that person. *Especially* if it's your bf of 3 years. He should appreciate your honesty. Honesty honesty honesty! It's the best way to give yourself a clear conscience. Don't hide something that is so effective on your mental health. Openness will heal that anxiety. You won't have to worry about people not understanding. Once people understand, they will listen to you stutter with rather empathy, or at the very least patience because they fully realize your frustrations. No one can use "well you never told me!" as a defense for their rudeness. Best of luck, much love. (sorry long question, long answer!)