HELP PLS

S
Okay so my boyfriend has moved to a different state and he just started university. He met this bunch of girls on his first day and they offered him a ride home, and he accepted. And now I logged into Facebook and find photos of him and them in a photobooth. I'm annoyed and he knows this but he keeps saying it's not a big deal but if I did any of those things, he'd be even more furious with me. Am I overreacting?