Boyfriend’s coworker

So my boyfriend has been working with this girl for a couple of years. They work on campus together. She tells him about her whole life. And the guys she likes at the time. Today he told me that she told him about this guy that she likes. She apparently told him that her and the guy “did stuff” and it was “her first time. Keep in mind we’re in our 20’s. Anyway, it just kind of rubbed me the wrong way that she’s talking to my boyfriend about these things. Should I be bothered or just let it go? It just seems odd to me that she would be talking to someone else’s boyfriend about these things. Does she not understand that he tells me everything she says?🤔