Do I (24f) tell my (24m) bf about a conversation I had with his best friend last year?

Last year at a graduation party, I met my bfs best friend. During the party, I wanted to take a social break and recharge a bit in my bfs bedroom. After a few minutes, his best friend walked in and decided to join me as he also wanted a break from the party. We sat on opposite sides of the room, and he was clearly a bit tipsy. He decided to tell me all about my bfs past relationships. At the time, my bf and I were together for a few months. He mentioned that my bf was completely different than he is now when it came to relationships and that he used to be a bit of a player. He would continue to tell me stories about those previous relationships. Im not sure why he wanted to tell me all these things. At the end of the conversation, he mentioned that I should never tell my bf we talked about this. Now, a year later, I'm still thinking about the conversation. My bf never mentions his past relationships, probably due to embarrassment of how different he used to be. But I kind of want to bring up the conversation I had with his friend to get some kind of closure so I don't have to think about it anymore.