Bfs snapchat

I was taking videos on his snapchat of him and our dogs then I happend to see he was messaging some girl on there. I asked he kept saying he didn't know who she was I told him he obviously does if he added her or vice versa and they were talking. He kept saying he didn't know and got mad at me for it. Idk what to think about it. In a way I know he's not cheating bc we live in a small town and I'd find out quick if he was and I usually know where he's at if he's not home and he doesn't ever go out. But that made me question things. Especially since he's not the best boyfriend to me to be honest. I love him so much, but I just feel like I'm not enough most of the time. And then finding that idk what to think or do.