No I would not be able to cheat. I lived through this when my spouse had an affair about 8 years ago. The deception and the lies nearly tore us apart. The fact that she went behind my back is what was so hard. I actually new about it the first night, we had been fighting a lot at the time and she told me what she was going to do and I let her do it instead of losing her all together. The next day she felt so terrible a bout it and said it would never happen again. Well it went on for about a year be hind my back, every time I confronted her she lied about it and told me I was overreacting and making something out of nothing. That’s what was so hard, the LIES and the lack of respect she had for our marriage. Once things finally ended, it took a few years to get our trust in each other back, she still carries some guilt around even after all this time. I could never go through an affair again.
Now if I new about it upfront I could handle a threesome or sharing her with someone else (this has always been a fantasy). But there is just know way I could approach a situation like that without clear understanding of what we expect out of the situation and having the trust and support of each other.

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Mind what poeple do not only what they say, for deeds will betray a lie.
Terry Goodkind, Wizzards Fifth Rule

There are two things a real man likes--danger and play;and he likes woman because she is the most dangerous of playthings.
Nietzsche


Monogamy does not have to mean Monotony