What do you think of me telling my ex she can't use my Facebook without asking first?
Why would you want to disclose your facebook password to your ex?
I don't. I'm not giving them my password.
Your facebook is none of their business. You shouldn't be giving your password to anyone.
I'm allowed to give information to them without their permission.
Yeah, you can give your password, but you're not obligated to and if you don't want to then you're allowed to say no. Also, if you're caught sharing some accounts then you could lose that account so I would be extra careful in who you give you passwords to.