Down Again - Is he done yet?

[DestinyUnknown]

For those of you who now my sitch, my H is again saying he is not happy. I noticed his somber mood for a couple of weeks now. To summarize our history:

1 - (from 2008 to Sept 2009) H and I argue constantly over everything. I am angry; he felt his feeling were ignored
2 - (Sept 2009) I search his emails and phone messages and found out about EA with OW
3 - (Sept 2009 to Nov 2009) H and I attempt counseling, but counselor was not pro-marriage and told my husband that since he had one foot out the door, that he should just leave; I moved into other bedroom
4 - (Nov 2009 to Dec 2009) H and I try to get along, but the week before Christmas, he tells me that I should spend Christmas with someone else because he didn't want to spend Xmas with me
5 - (XMAS Eve 2009) H packs and leaves our house to move into a hotel near OW
6 - (Jan 2010 to March 2010) H is seeing OW and being truly ugly and disgusting towards me; has me served with papers to separate
7 - (March 2010) I have emotional breakdown and want to end my life; fortunately and with God's grace, I pray
8 - (April 2010) H is deployed to Afghanistan
9 - (May 2010) I begin to GAL and re-associate myself with friends and some family
10 - (June 2010 to July 2010) GAL'g and having a good time; traveling and getting to know a better me
11 - (Jul 2010 to Aug 2010) H is attempting to contact me via email and phone from overseas. I was dark, so I did not respond.
12 - (Late Aug 2010)H emails me to say he misses me and asks if he has lost me
13 - (Sept 2010 to Oct 2010) H and I email and Skype almost daily
14 - (Nov 2010) I traveled to Norway to meet H; nothing physical happen and we really get to know each other and spend time together
15 - (Dec 2010 to Feb 2011) H and I continue to talk
16 - (April 2011) H returns home
17 - Fast foward to December 2011; H seems distant and depressed

I am not sure what to do or say at this point, every time I ask as question, I think he notices old patterns and so do I. How do I prevent myself from going down that path again?
Any suggestions is appreciated.