don’t be embarrassed or ashamed! These are the cards that we were dealt so take it as it is. If you been dating him then he probably notice something with your speech. I’d start by saying “I’m sure you noticed before but I stutter”. I’ve had many instances where I told a guy I stutter and he would be like” what I didn’t even notice” or”I know but it really isn’t that bad”. So what I’m saying is he probably noticed it but it doesn’t effect how he feels about you.