In one of my spanish campaigns (H/H), I had a marriage alliance with bith the danes and the french,
Now the french were being destroyed by the relocated english (they had been kicked out of the british isles by the scots), so I decided to do something about it, and attacked english holdings in northern france (after getting military access from the desperate french), however I didn't wanted to take any chances and so I decided to reinforce my french frontier garrisons and I sent a diplomant to give money every turn so to keep the relations at perfect with the french, also I gave the first territory that I got conquered back to france, however before I could get a seconds one, the french attacked one of my frontier cities and thus betraying me, needles to say I apologized to the english and proceeded to wipe the floor with france
Evere since that, I never bothered again with marriage alliances, though I may give it a try again as this happened before the patch, perhaps with the patch the AI actions will be a little more logical
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