Just Prior to or During an Affair, Exactly What Goes Through the Mind of the OM?

Given the parameters as well as the facts of my case, the "primary" OM (keeping in mind that there were two of them, however) that my STBXW "hooked up with": Knew STBXW as far back as her college days. Was best friends with and a co-worker with STBXW's first husband. Was married and later divorced himself. Was on the wedding invitation list for my marriage to STBXW. Think that he and "a guest" only attended the gala reception. Was formally introduced to me in our home some 4 years after our wedding when he was just "passing through" town. Had full knowledge that STBXW was already a "married woman." For some 2 years prior to our separation, unbeknownst to me at that time, had a ratio of nearly a 20:1 cell phone call/minute time with STBXW. Knowing that STBXW had a functioning marriage, with a large "blended family"; was rather active in Church, community, and social activities; knew that STBXW was left to be rather wealthy after death of her first husband and his best friend ~ What exactly goes through the mind of a person like that? Is there no consciability over the welfare of that marriage from an ecclesiatical/religious/social perspective? Or is it greatly like the old addage of "a hard appendage hath no conscience." As a person who has way too much respect for that holy institution of marriage and has never even given a scintilla of thought to ever desiring to cheat, I would love to know what the OM's true psychological thought-process is on this issue, and if there is any degree of consciability involved on his part. Now it's largely a "given" that he would have been "led-on" by STBXW, in her reconnecting with him on FB, but what, if anything, could lead him to be wantonly proactive in the dissolution of a marriage of which he is fully aware of?

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