I dunno about agreeing to divorce, but yes nm you got the idea... I don't ordinarilly advocate endorsing divorce to shake a spouse up unless NOTHING ELSE seems to wake them up... EVERY OTHER rock should be lifted FIRST before that sucker
BUt ya, you got the rest of it solid... keep changing things so he's on the defensive.
try this instead, its a bit diffrent :
"I decided I can't trust you, but I deserve a husband who is protects and supports their family not some predatory woman. We need a loving father and husband who puts us first, but I haven't seen a real man around here in a long time."
