confused lol

my daughters biological dad's ex wife messaged me on facebook apologizing for what he did to us (cheated on me with the wife when I was pregnant and never spoke or saw him again). And saying that he's is an asshole and whatnot. She sent me a friend request and I added her (but put her on restricted so she can't see my stuff). I just wanna see if she's trying to get information or something.
 And then today November 23rd I woke up to a message from my ex fiancé' (not the bio dad) Saying   
I'm happy that your married now and living the life you deserve and wanted . Wish you and your new husband the best laura. We broke up on bad terms and haven't spoke in a year or two. 
I just don't understand why they are saying this to me. It's nice beause I've always hated the wife and just didn't want to deal with my ex fiancé'. I'm just confused. The but ex wife did explain why she messaged me but not the fiance'.