I feel the exact same way! I’ve been dating my bf for over 3 years and I ended up telling him about it 1.5 years in when I was drunk, but then didn’t mention it again until a few weeks ago. And he was so supportive and encouraged me to go ahead and book speech therapy sessions (since I was telling him I wanted to do but was a little nervous). So if he is really the one, if you tell him he shouldn’t care at all. It felt so good to finally tell someone about it. Also now he is more of a safety blanket in situations where I’d stutter more.