You, like me, stutter. Nobody knows cause we always try to hide it and (are able to) do it well. It's called a covert stutter as opposed to an overt one. You should definitely tell her imo. She'd be like "No you don't" to which you just smile and (I'm sure, eventually) she'll understand. But do it. Open up and be vulnerable. You can do it. I just tell ppl who I know on an intimate basis, friend or otherwise. I do it cause I feel that it's a part of me and so is honesty. But you do you✌️