Would you be upset?

A coworker of mine logged onto her boyfriends Instagram account and looked at the photos he liked. They were all selfies of girls and some girls with booty shorts on. She flipped out and literally broke every single picture frame in their house. They’ve been together for 10 months. She also got upset when her boyfriend sat next to his sister in law and she thinks there’s something going on between them because of their body language. Let me remind you that she is in her early 20’s.

When her boyfriend got home from work, she literally beat the shit out of him and almost gave him a black eye. She wants advice from me and I have no idea what to tell her because in my eyes, that’s reaaaaally petty but I wanna be there for her. I’m clueless what to say because this really upset her.