I'd stop worrying about fixing the M and start worrying about fixing you. You've admitted you have some areas to work on....are you focusing on them? What changes do you want to make? What issues do you need to resolve?
With regards to FB, I think it's fine unless you drive yourself crazy with it. If you are, then block her and avoid the headaches. The bank account, if it's joint, I'd be watching it like a hawk too. You already asked her to cancel it, so get it done.
You guys seem to throw D around a lot like it's no big deal. 6 months in and already D talk? And you are throwing in the towel at that point? Do you really want to be married to this woman? At all? Usually "til death do us part" drives a little longer timeline. I'm not judging, I'm just saying, if your heart's not in it, why are you wasting the time?
In terms of chasing...if you understand the relationship is broken, and there need to be serious changes on both sides (and it sounds like it), then I would shoot for the changes, or you are just prolonging the inevitable. Fix your issues first....see if your W wants to come along.
