Should I be mad or no???

Okay so one night I almost lost my virginity and after it happened I called one of my bestfriends to vent and get things off of my chest and the next day we kinda texted about it. Well I told her not to tell anybody and to delete the messages. So her boyfriend is always in here phone 🙄 and he seen what we were talking about and he mentioned it to me and I was kinda mad she didn’t delete it but I was like whatever it’s just him. Well tonight I was on the phone with my boyfriend and he was like you told Cindy (not real name) what happened and I was like why you say that and he said bc he seen her boyfriend and he said he knew. I’m slick mad bc I told my friend not to tell anybody and delete the messages but yet her boyfriend went back and bought up the situation with my boyfriend. I know things should’ve been kept between me and my boyfriend but I really needed to vent and I felt like I could trust my bestfriend. I feel like it’s bothering me so bad bc I already have really bad trust issue and that just made me not even want to vent to anyone else and just keep things bottled inside but that’s not good either. Am I being extra about this or should I feel some type of way???