OPINION PLS

So my boyfriend loves his job and gets along with everyone he works with which makes me happy for him. However, there is one female he works with who has recently added him on all social media and added on me on all social media. I had no idea who she was because he had never mentioned her before but I saw they were friends on insta that’s when I asked him who she was and why she was following me, a person whom she’d never met or spoken to ever. He said they were homies and whatever but then I let my worries get the best of me and I checked his insta. She has a boyfriend but based on the messages to me it looks like she’s hitting on my boyfriend... I trust him and don’t think he’d ever let anything happen with her. But I was upset that he didn’t do anything to stop the fact that she was hitting on him. Based on this picture of just a few messages, do you think she was hitting on him?