Bestfriend deceit😕

My best friend is a guy and he has a girlfriend. I knew he was messing around with two other girls which I kept my mouth shut on. He logs into Instagram on my phone and just leaves it there and suddenly my phone is being blown up with all these notifications which consisted of other females conversations with him. Me being curious, I opened and read each one. He had four other girls in his phone. One he told he loved her, two of them he uses for strictly when he’s “in the mood” and the other one he’s attempting to start a relationship with as a rebound. I couldn’t be friends with someone who thinks of girls as these unbreakable things without hearts. He didn’t choose “hoes” that’s what made it worse, he played with the good ones.