interesting,
not sure what made me think of this but do you feel like it was present time, or you were in the past, or did it seem like a preminition.
It's weird how dreams can give added information that might not be viewed within the context of the actual dream

Very interesting dream. My ears perked up the way you mentioned your Ex's involvement.

When it comes to UFO encounters in the dream realm, it's very difficult (for me) to write it off as "just a dream". The reasoning for me, which I also noticed in the cadence of the way you wrote your story - is that you begin to realize things AS you are dreaming.

You thought the ship was only a pipe-like structure. And then as the dream progressed you learned it wasn't.

Now to criticize this as a metaphor this would be a key part of the dream - but I think this is evidence it was something more (Or that the mind itself is just freaking amazing).

--- About your Ex, when I have my UFO dreams - there is almost ALWAYS a "friendly" there. In many cases including my own experiences, this is considered the "Guardian or pacifier".

Example: Have you seen the movie Contact? When she finally meets the E.T, it assumes the form of her father.

I am not saying necessarily that your Ex was actually an E.T trying to show you something (such as the future) - because the Mind also simply likes to just "take a friend" when experiencing a very intense dream, such as a UFO dream.

The fact that it was hostile is very interesting. Also reminds me of some sort of military prototype, the way you describe the craft. As the stealth mechanics you bring up aren't very "advanced" rather they seem that they are more designed for Earth.

i had a dream of a spaceship who's pilot looked like a blue budda. Now the spaceship in question looked like your run of the mill flying saucer but the pilots controls looked eerily like a school bus with the open door handle and everything, anyways the budda dropped me off in a strange trailer park and took off. Weird dream that made no sense but oh well