<human>: Can you provide a brief rundown of the text in within 3 sentences?

I told my boyfriend about a guy I was friends with 6 years ago when I was 18. This guy kissed me while we were in his room, which I was ok with because we were friends and I wouldn't have minded going out with him. But after making out he took out a condom and wanted to have sex which I didn't like because he hadn't asked me out yet and only just started kissing me. I told my current SO that even though I kissed him I was strong for saying no to sex and not talking with this guy anymore. The reason I said that I was strong was because my SO had previously told me I was weak for letting this guy use me and was trying to protect me from more guys using me. (Which makes no sense why would I kiss someone now when I have a boyfriend). 

All my SO had to say this time was that I made a mistake for kissing him and that I can't just kiss people I dont know well enough. I told my SO that I knew the guy well because he was an old friend, but my SO thinks I just still didnt know him and kept arguing he was just trying to help me and that everyone makes mistakes . Did I really make a mistake?
<bot>: my boyfriend says I made a mistake for letting a guy that turned out to just want sex kiss me in the past.