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As for your second question, from what I've learned here and about infidelity, I feel that someone would stay until something (someone) perceived to be better came along. You'll read a quote quite often throughout here: be a spouse only a fool would leave.
Me: 31, W: 29 T: 4 M: 2 Kids: 3 (SS: 7, SD: 4, D: 3) Separated, still living together: Nov 2013 Separate bedrooms: Feb 2014 W working away; kids with me: Nov 2014