Apricot10 first can I say you are MAGNIFICENT.
Your story resonates with so much of us here. Why are depressed men (and he clearly is depressed) SO DESTRUCTIVE? WHY do they blow up everything that is important in order NOT to deal with their depression?
The psychiatrist who first took an interest in affairs and tried to work out why they happen:
"Romantic Infidelity
Surely the craziest and most destructive form of infidelity is the temporary insanity of falling in love. You do this, not when you meet somebody wonderful (wonderful people don't screw around with married people) but when you are going through a crisis in your own life, can't continue living your life, and aren't quite ready for suicide yet. An affair with someone grossly inappropriate—someone decades younger or older, someone dependent or dominating, someone with problems even bigger than your own—is so crazily stimulating that it's like a drug that can lift you out of your depression and enable you to feel things again. Of course, between moments of ecstasy, you are more depressed, increasingly alone and alienated in your life, and increasingly hooked on the affair partner. Ideal romance partners are damsels or "dumsels" in distress, people without a life but with a lot of problems, people with bad reality testing and little concern with understanding reality better.
Romantic affairs lead to a great many divorces, suicides, homicides, heart attacks, and strokes, but not to very many successful remarriages. No matter how many sacrifices you make to keep the love alive, no matter how many sacrifices your family and children make for this crazy relationship, it will gradually burn itself out when there is nothing more to sacrifice to it. Then you must face not only the wreckage of several lives, but the original depression from which the affair was an insane flight into escape.
People are most likely to get into these romantic affairs at the turning points of life: when their parents die or their children grow up; when they suffer health crises or are under pressure to give up an addiction; when they achieve an unexpected level of job success or job failure; or when their first child is born—any situation in which they must face a lot of reality and grow up. The better the marriage, the saner and more sensible the spouse, the more alienated the romantic is likely to feel. Romantic affairs happen in good marriages even more often than in bad ones.
Both genders seem equally capable of falling into the temporary insanity of romantic affairs, though women are more likely to reframe anything they do as having been done for love. Women in love are far more aware of what they are doing and what the dangers might be. Men in love can be extraordinarily incautious and willing to give up everything. Men in love lose their heads—at least for a while."
www.psychology...lection=60696