My boyfriend came home today after being gone all night. I had no clue as I was across the street getting cough medicine from local store, but our seven year old son who was sick video called me and told me "The Nanny" his dad got was making him soup. He has no nanny. When I rushed back home, I found my boyfriend hungover/knocked out on the couch and some random girl he's been sleeping with talking to my son while he was eating.
She told me she didn't know about me or my son, and that my boyfriend said he lived alone. I'm guessing he was expecting me to be at work and my son at school. Anyhow, I kicked him out pretty aggressively. Made him pack his stuff, and told the girl to just go. My mother thinks it was wrong for me to do because of how it will affect my son. Thoughts?