Surely life is hard enough without voluntarily doing any of the following:
Affairs (they're not fun, they don't provide escapism & you can't run away from the person you've become by having one)
Sacrificing too much to pursue stressful, demanding careers that put £££'s in the bank but ultimately give them no real quality of life
Taking on relationships/friendships they know are going to be trouble.
Just why? It's quite obvious these things are self-destructive. They don't lead to happiness, or peace.
Money is money, beyond having enough for the basics it's an obvious slippery slope of constant comparison and resentment. Not worth literally selling your life for surely?!
Affairs..........people run from things, not to things. It's just a physical manifestation of your own inadequacies that you've failed to deal with. Always ends in tears or nearly always.
And doggedly remaining in/seeking out destructive, shit relationships or remaining in broken marriages, most often "for the sake of the children." Children are astute, and will model what they see.
Is it just a human flaw to knowingly seek out attachments that will increase our suffering? We have free will, and the ability to make our lives simple and thus, happier, - but not many people choose it. Why?