Confronting my BF

My bf told me he had this hot new girl follower on social media. He said I should have friends like her cause she’s good looking. I added her and she blocked me. He told me he messaged her and thanked her for the follow. Today we were laying down together and when he went to go message someone on there, I noticed her name wasn’t on the list of the people he recently talked to, which means he deleted the messages. I’m wondering if I should confront him about this and how can I start the conversation. Straightforward? Ask him what they talked about? Just let it go?