This is unfortunately really familiar.
Sometimes asking people to not directly out you doesn't help. When I came out to friends I asked them to not out me, but told them if someone asked about me I would prefer if they tell those people to ask me directly. I don't want others to feel obligated to lie or cover for me, but I would rather have control of the situation and be able to decide for myself whether I was comfortable with the person knowing. And I totally admit to stealing that idea from someone on here, but I don't remember who

Although one of my friends has respected that wish, my best friend since we were like 11 has outed me to most (probably all) of his friends. When I confronted him on it he told me that he had told "a couple" people that I was changing my gender - slightly problematic wording aside, I figured it didn't matter because I didn't know the people he told and assumed I wouldn't meet them. Except I've since learned that he told a lot of people. And worse, what he told some people was completely ignorantly wrong - to some people he didn't out me as a transsexual woman, he outed me as a gay man. WTF, right?. I've distanced myself from him and I really don't see our friendship lasting much longer.
Another one of my friends, who is also in transition, lives her life a lot more openly than I do. I had to ask her to not introduce me as "This is Kelly, she's trans like me too" because she just didn't think about whether I would be comfortable with that. I'm not ashamed of my history or experience, I have no problem associating with other people who also happen to be trans if our personalities mesh, but I'm a lot more comfortable introducing myself or being introduced as "Kelly." Not "Kelly, trans female" not "Kelly the transsexual" and not "Kelly, she's a girl" because that one's just kinda weird. If my trans history comes up for some valid reason and I want to out myself, then I will on my own terms. I wish that weren't so hard for people to understand...