Dear Keke and Kat: I Cheated, Now She Wants My Passwords

Is it logical and fair that this guy's girlfriend wants his passwords.. and wants to pick the girls she wants to block from his social media and text?

He admits that he cheated and this is why it's gone to this level.

*disclaimer: we understand that a relationship like this probably isn't the healthiest and they may be better off if they break up. But, he's asking the question, so we want to help get him some answers.

Would you hand over your phone, given the circumstances? Or would you keep your passwords to yourself?