Facebook Help? I'm confused?

[Robin]

I need your opinion my boyfriend is communicating with his ex through Facebook. We got into a big face over it. She is still on his Facebook page. What does he need to have in common with this girl? He made me block one of my ex boyfriend. What should I do?

[Questions]

Create another account add his ex and spy you know ask her questions about him, it was done to me once. It was not easy to find out. Hope this helps