Df recently told me that he and his dp want to get married (not in a "We're engaged!" way, just as a future plan). I don't know if he's told my dbs, but he talks most to db1 so there's a good chance at least he knows.
I think it's probably not up to me to tell, but I'm staying with dm and I feel like I'm keeping secrets from her. Df and I have a somewhat rocky relationship and I don't really want to ask him if I can tell (I know I'm probably being immature there).
So MN, is this something I can give dm a heads up about, or do I need to keep quiet and put it out of my head?