This is tough stuff to have to read. It's tough enough to have to deal with it, but waking up to that really blows.
I wish I had some great advice or words of wisdom here, but I don't. Perhaps the best plan of action is to do what you gut tells you to do. What does your gut tell you to do?
I think the legal separation is a good middle ground for people like us who don't want a divorce or believe it's the answer. It covers us financially and gives them a little. Personally, I would have the papers say you a separated before he deploys, it's just the right thing to do if he isn't sharing any of that extra money he's getting with you like it's assumed he would.
I guess for the short term, go study, rock your exam! Do something, anything, to busy yourself and not wallow. Let me know if you want to meet up for an early 2nd Saturday coffee or something. I'll have the kids with me and my friend isn't playing at Java City next weekend, he's playing tonight. Actually, there you go! Go sit at Java City tonight for some studying and some live music. Tommy starts at 7pm.
Me: 42/H: 37 T: 10 years/M: 8 D9, S8 Bomb: 7.23.07 Separated: 1.20.08 D Final 3.19.09 Affair started in '05, found out parts in 11/07. They married 11.26.09