Wife walking away

[LBSinTX]

My wife told me last Thursday that she wants a divorce. No trial separation, etc... We are still in the house together but sleeping in different rooms. I will be moving out with my two daughters from a previous marriage and she will be staying in the house with the two children we have together(7 and 8.) It's been pretty turbulent the past 3 to 4 years, and especially the last 2 years, since my teenage daughters came to live with me. I sensed it coming for a while. We went to counseling. I made some progress but still had some regressions. I became so focused on her feelings that I alienated the kids, and pushed her further away. She went on a weekend getaway with my 19 year old stepdaughter over the weekend and since she came back she has been texting someone non-stop. I believe it was someone she knew before via Facebook that also happened to be at the gathering. This person had been commenting on every Facebook and Instagram post of hers over the past few weeks. I showed my jealousy when I noticed and it came up in counseling that I was being jealous and making a big deal about nothing. I still want this relationship to work. I expressed that desire but I have not begged or pleaded or pursued anything as I know it will only push her further away. I am acting happy and I am relieved in a way because I don't believe that our marriage was going to be fixed in the current environment. She says she loves and cares about me and said maybe she wasn't "in love" but seemed unsure when she said that. I take a lot of responsibility for the problems in our relationship. It takes two to tango but it was 80 percent me and 20 percent her. However, she is unhappy with the house which is disrepair, her job, my kids, her weight. She was told by the counselor that we saw that she likely has clinical depression but I think she's blaming everything and everyone else for her unhappiness. She's riding a little wave of enthusiasm and happiness right now but is still worried about making it on her own. I told her if the relationship is going to end that I'd like it to be on friendly terms but there is an impenetrable wall up between us. It's funny. She makes small talk occasionally and we get along well and the next time we interact she won't even look me in the eye. Last night I went out to run some errands and she asked me where I was going? Why would she care? Has anyone gone through or is anyone currently going through a similar situation? Any advice would be greatly appreciated.