I say the indications are that Lori started looking outside her marriage around 2014/15. Not necessarily for an affair but for something new - she lacked drama and conflict after 8/9 years of marriage. Those hadn't been quiet years of marriage either, there were court hearings and custody battles and the odd psych. evaluation, as well as JJ's formal adoption in 2014 as a two year old. Big moves, mainland to island, then back to mainland, especially knowing how much Lori loves Hawaii, likely signal a problem she was trying to fix.