You're about 4 months ahead of me in this wicked game and I feel your pain man. I am pretty well you are in the thought process at this point, I don't think there's a lot more of this I can take. OM was involved at the start of my sitch, I can't confirm or deny if they're seeing each other now but they do remain FB friends so they probably still communicate...
I don't have specific advice beyond going dark, which I have tried to do many times and failed. I have been successful in spurts longest being about three weeks that I broke last weekend.
It sounds like you are well on top of GAL, that is probably the best thing you can do to try keep your mind off the sitch. It sounds like you have your mojo back if the ladies are all over you, going dark and not responding to her for some time could really make her think... That's what I'm going to try next and in theory that will include not contacting her over mothers day or our anniversary.
Just my .02 and my well wishes to you and your sitch, keep your chin up and good luck!
me 38 W 30 T 3 M in 05/2010 Separated 08/2011 Stephchildren (all hers) SS17, SS12, SD8 I filed 8/27, she countered I filed response 9/5 Anxiously waiting on the judge!