I hate to say it but if it were a one time thing, a regret and an accident, she'd have come to tell you rather than having you find out on your own.
There's a good chance that this isn't the only time and won't be the last, unless you can figure out why she's unhappy and fix it, or move to an open relationship, but if you're already jealous that isn't very likely.
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Halfway to hell and picking up speed.
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