Would you be ok with this?

Long story short my partner cheated on his ex wife a number of times he did get caught and it was part of the reason for there separating. He lost everything because of it and says he would never do it again because of not only the pain he caused others but the pain he caused himself........

He was single for a year and half until we became a couple and we now live together 6mths in. One of the girls he cheated with, then had sex with a few times while single contacts my partner all the time..... she often calls when drunk at 2am (but he doesn’t answer) she accidentally overdosed and he was the one she called to pick her up. She snapchats him all the time and comments on Facebook on everything.He says they are friends that’s why he always replies. I’m allowed to read any msg whenever I want.

However..... WOULD ANY OF YOU BE OK WITH THIS GIRL STILL IN HIS LIFE?