Worried

Vi

So my boyfriend and I have been together almost 3 years, we just moved in together. But 6 months ago my boyfriend and I were laying in bed and his phone went off he growled and put his phone on his other side. So I kind of went through it found some messages that made me uncomfortable. He was talking porn stars with one; had a month long steak with another. He never mentions these girls and now he deletes anything from girls in his Snapchat but the are still showing up in his best friends list. There’s third girl now and I’m not sure what to do. We’ve kind of talked about it but he doesn’t say much about the girls and never mentions any friends other than guys and their SOs. He also won’t mention anything about his past relationships even if I just ask for information. I just wand to know if there is a reason for concern.