Afraid to converse with my girlfriend sometimes

Afraid to converse with my girlfriend sometimes For some background, I’ve been stuttering for most of my life, and I’ve faced bullying and insults because of it. For a long time, I eventually learned to not care as much. Now, I have amazing friends who accept me for who I am, and a girlfriend who does the same. She knows about my stutter and even calls it cute, but I still find myself feeling afraid to speak with her sometimes. Mostly because i worry that i might stutter. Why is that? How can i break free from this fear?