My boyfriend told his female friend about our personal problem? Is this a red flag?

So my new boyfriend and I have been together for a few days now. So far I see a lot of green flags beside this lack of communication with a situation we faced. I’ll just say we jumped kind of head on with sex because we both got the best of one another and wanted to try it because he was a virgin especially.. he didn’t tell me till after it was over. We weren’t really prepared with lube and he was eager to be honest. He was upset about how he couldn’t finish and whatnot but he promised that it wasn’t my fault or anything I did wrong. Yesterday we had sex, it was our third time and he finally finished. What I’m upset over is how I saw a text with his female friend saying “no she didn’t turn me on” “I couldn’t finish” He didn’t even bother telling me about this girl when I was completely open about my two male friends I have but I didn’t discuss something like that with them. It was really off putting for me and I wanted to leave and go home and cry but I tried to handle it the mature way and hear him out. He told me he was just really frustrated and didn’t mean any of what he said to her but now I feel awkward and embarrassed if I ever have to meet this girl and she thinks”oh that’s the girl who didn’t turn him on” or something. I have self esteem issues cause I used to get bullied. My boyfriend reassured me how stupid it was to open up to her about stuff like that and if I want he can stop talking about her all together. Do I have the right to feel uncomfortable and bothered by this?

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10 mo
I’m also his first relationship in four years, he told me he has to work on his communication better that it was something stupid of him to say and that he didn’t mean it all and that I’m “beautiful “ “sexy” “cute” and amazing to him but I can’t help but feel those painful words in my heart.. I know it shouldn’t matter what any guy says in general but I just hope he's not gonna go behind my back again. I also have trust issues because almost every relationship I was cheated on.
My boyfriend told his female friend about our personal problem? Is this a red flag?
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