Tidal forces cause them to slowly spiral toward each other. The Moon is gradually getting closer to the earth.
I'm not expert, but everything I've read indicates the opposite. i.e. The Moon has gotten and is getting farther from the Earth.
And wouldn’t two stars entering a death spiral start mixing atmospheres long before collision, thus avoiding the big collision discussed? The near sides would experience much reduced gravity and be blown into the space between, no?
It could be viewed in a couple different ways, but the moon is departing. Whether it is in fact already past the point of no return might be interesting to look at. It is in fact already gone, has achieved escape velocity, is a planet on its own. Bu-bye.