I think you mentioned your mother's fortune teller in another post. I am just curious as to what she might have said, if you don't mind.
I attend a metaphysical church and happen to know many mediums, some really good, some not quite so intuitive. I have been told many many tidbits about my sitch, which amazingly have all come to pass. I know many people would scoff at that type of stuff, but I have been given proof as to the validity of it more than once in my lifetime.
It sounds like little baby steps and that is fantastic. You also seemed to grasp alot of the GAL ideas, much quicker than I or some others. I will suggest to do your best to let go of the A. Honestly, you probably do not want to know all of the details, and if I might be so bold, would they really make a difference in how YOU want to proceed with this? If you assume they had sex (which for most people is the worst scenario, for me it is the EA), then you just heal and forgive from that mindset. Unless, that is something that would make a difference in your stand. Then that is something you probably need to try to uncover the whole truth about. Just MO.
"Acceptance doesn't mean resignation. It means understanding that something is what it is and there's got to be a way through it."--Michael J. Fox