TIFU I regret it

I really regret something I said, it was a friend’s secret and I am very sorry. To put them in context I had a friend in high school, we considered ourselves good friends but not “best friends” but we got along very well. At that time in high school, she had a boyfriend who, to tell the truth, I didn’t care about (like all of my friends’ boyfriends). They were about to celebrate a year of dating. I knew this because she asked me to edit photos and videos with songs in an editing app. moment. But one day she comes walking strangely, I asked her what was wrong and she confessed to me, she had given the “proof of love” to her boyfriend the night before, I don’t remember what I felt at that moment but she was surprised and she told me that was her secret. Years later in high school we no longer spoke to each other (I already had time for that) she was in a different class than mine, and she had a work team where her now ex boyfriend was, I never felt comfortable in that group and I felt like I didn’t fit in and they used to make fun of me frequently, one day talking the topic of boyfriends came up and the “first times” everyone was talking about it and they asked me, I didn’t want to say anything and I tried to leave but they supported me with the excuse of “play” and I turned to see my friend’s ex and I told him that if he didn’t let go I would tell everyone his secret (that he had already done it) he had denied it but by saying that I increased the insistence of the other boys, they wouldn’t let me go and when I said that my friend’s ex had already done it they started bothering him until they asked me who I had done it with, I didn’t say anything and they started making their theories until they said my friend’s name, they asked me and I didn’t say anything, I think that with my silence they confirmed it. “TL;DR:” The next day many people already knew that and I had a meeting with my friend where she asked me why I said that, I tried to explain to her that my intention was never to tell on her but she no longer wanted to listen to me and left, I did not speak to her again in that last meeting she told me that she was disappointed. And if one day you read this, I want you to know that I am sorry and for me she will always be a good friend.