How do you feel about the fact that I don't want my girlfriend to be friends with one of my old friends?
I'm not sure how I feel about it. Do you think she'll follow your request?
I think if she knows it's not what I want she'll stop being friends with her. She usually listens to my opinion on these matters.
I don't think it's right to try to control your partner's friendships. You need to trust her that she knows what she's doing.
She'll listen to me.
Maybe she will, but I don't think it's appropriate for you to tell your girlfriend that she can't be friends with someone. That's very controlling, and not healthy for your relationship.