This guy has probably thought about you a lot over the past 8 years. It's clear that you were his first love. I would say be kind, be gracious, and still get your point across. You must think he's an essentially good person, or you would not have given him so many chances
'The best revenge is to live well.' Oscar Wilde said this, and he would know! It's been one of my favorite quotes for over 30 years, and words to live by.
He's the one stuck in a cult, and you are free. It sounds like he's always been kind. Take the high road. (It is also the intellectual and smart thing to do, and will show your contentment in life, and lack of need for 'Jehovah'). xx tal