I've been told, and witnessed, those who choose to leave, or cheat on one partner or spouse, repeat the behaviour quite often, (what do they say about "getting your retaliation in first"?).
A friend of mine, who was the first woman I met through internet dating, and she figured out within the short meeting at a bar, we were not suited. However, most unexpectedly she turned into a good friend afterwards, even when she met a great guy " the normal way", through attending events their respective children were involved in. Anyway, this woman would not entertain any man who had cheated on their wife/partner as she believed they were bound to do the same to her, if the going got tough, as she was pretty astute!

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