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If you really believe she's doing him wrong, you should have told him -- BEFORE the marriage. Of course you risk your friendship, but if you truly believe he was getting screwed over, you should have told him.
But it sounds like you let them get married without telling him. From my point of view, if you let things go that far without telling him, you've already let the damage be done. But they are a couple _now_, and it's possible that they might make it. So telling him _now_ might just make the whole marriage even more likely to fail. Even if she straightens up, maybe he'll now feel he's "entitled" to screw around a little himself, because he's been wronged.
At any rate, you let it happen, and now it's reality. I don't think any good was served at this point by throwing a bomb into his trust. I would have just kept my mouth shut and hoped for the best. And maybe, if she started screwing around again and you knew, tell him about that.
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