Try to forgive your wife, who sounds fairly typical—hard-wired and programmed with a woman's biological and cultural life priorities, which tend to be quite different from those of a man. It may help to remember: if you had your wife's hormones and conditioning, you'd very likely also have acted the role of a jealous, controlling, resource-extracting bitch who gets her ego strokes by making her husband feel he's not good enough.
Evolutionarily, women and men are locked into never-ending combat over the issue of sex. Most women will, understandably, use any weapon at their disposal to win this battle—emotional and sexual blackmail, as well as laws, religion, mindless moralizing—to beat down a man’s sexuality.
So unless he's desperate for kids, monogamous marriage is a bad deal for a man with normal testosterone levels, guaranteed to lead to frustrated desires for freedom and sexual variety.
Best of luck for the future, brother! Use your new freedom wisely—for example, by taking a long vacation in a male needs-friendly Asian country, as I'm about to do.
Remember, the lucky ones in life are usually those who make their own luck, by being smart in their choices.