Is it messed up if I stay quiet?

Hey guys. Me and my best friend drifted apart for a few years when I left for college. I’m back in town now and We are cool again, getting closer. However.. I saw her boyfriend at the movies with another girl. He had his arm around her. Looked sus to me. I don’t wanna rock the boat here…
I just like having my friend back with no drama. Is it messed up if I stay quiet?

Kaitlin, Portland, OR 22