Just a disclaimer, dreams don't tell you anything but what you're already thinking and experiencing. You ultimately know how to interpret what your dreams mean, since you know best what's going on in your life. The church made you feel protected - it was a safe haven against the scary, confusing storm outside.
Perhaps you're finding comfort in your religion during this breakup, or perhaps the house represents something else you've been finding protection in, to fight against your emotions. Clearly your ex-boyfriend represents your ex-boyfriend. Sometimes this isn't always the case - past boyfriends can sometimes represent current ones, if you're scared your current relationship might be going down the drain like the last one.
But since this is a recent breakup, I'm pretty sure that's what this is about. It's clear you're thinking of him all the time - I find that I don't dream about something unless I'm actively obsessing about it in waking life. The letter I think you have pinned down pretty well.
He's not communicating with you - either explaining his actions, or his emotions post-breakup. He may be saying a few things, but you're just not getting the whole picture. This is like the letter in your dream - you're looking at it, but what is it really saying?
My advice, if you've broken up - either by his decision or yours - let that go. There is more of your life to live, and as important and consuming as your emotions are right now, time will heal all. If he doesn't find enough respect for you to explain himself or maintain some kind of friendship with you after the breakup, then he's not worth the energy.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.