Keep up the strength. You are doing great, this news will throw anyone off, so make sure you take the time to digest it, don't do anything right now, as there is nothing to do at this moment.
Start taking stock of what was purchased during separation (as you won't be liable for it).
As far as her having an A for 1 year, that is just wrong brother, remember these are her decisions and she will have to live with the consequences and guilt. In regards to the man, what is there to do? confront? Where will that get you? At this point, what's done is done, but it hurts like hell, vent, cry, go to the gym punch something. Have faith that our Lord has something great in store for you my brother.
Please continue to post during this time, as it will help you lots, and I am here to help in anyway I can
M: 34 W: 33 S: 7 S: 14 months BD: 6/2015 Separation: 6/2015 Back and Forth between Home and Moms