Best Friends ? (with W) I don't think so now. I think your main focus should be more on adequate co parenting with W and being friendly with her, but maybe not best friends. I think trying to be her best friend would get in the way of your process of moving on with your life. The last line of your last post shows (I think) that you have the realisation that you need to move on.
Hey I want to be a friend on this board but I want to hear loads of stuff about what you gonna be doing for the future. I don't wanna be hearing about W and her BF.
So I've got my listening ears on for your updates.