trust issues

Brianna • 🍄
The other day my bf and I were watching Netflix but it was slow. So he went to the bathroom and I closed out his tabs. I saw Facebook was one and when I went to close it his messages were up. And he had messaged a girl a couple weeks ago saying "hello:)". This girl was obviously hot and had long hair, big boobs, and lots of makeup. Nothing really compared to me. Haven't confronted him about it yet cause we're out with his family. He took me home for Christmas break...what do I do?