I hope you got it out of your system, because messing with his phone, his FB, his emails, or anything else is likely to get YOU in trouble. We all know he's a piece of crap. Don't stoop to his level. You don't need to do it, and you don't need to give him ammunition. You don't think he'll have his password reset and realize you did something to it? However much he deserves to be messed with, there is no way it can benefit you, and it's likely to land you in trouble. Let it go. Be glad he's ready to walk--that's what you want.