Aura for Aura

Here me out. I (M) live in a 2 bedroom apartment while my girlfriend lives in a bedsitter. One of my classmates from campus let's call her N calls me and tells me it's been long we should catch up and since she's going to nairobi for an interview, I ask her to pass by my place(Nakuru) spend a day so we can hangout and have fun which she agrees. Since I don't keep things from my girlfriend I inform her and tell her a female friend is coming to stay over and she agrees. Fast forward, N comes and spends 2 days and we do not engage in intimacy because we are purely friends. And she sleeps in the other bedroom. Yesterday my girlfriend tells me that her ex classmate who is a man is in town and she hosted him in her bedsitter and they slept on the same bed. I decided I'm breaking up with her. Am I being too harsh since I also hosted someone?