Jeez Tim, it's been 2 years, surely your butthole has healed by now. If that were true, I'd have taken the dozen or so earlier opportunities presented to me to shaft Alanna, instead of saving her ass. And technically, Amaury never actually betrayed her. The first time he got banned after Fulco sold him out, and the second time you rage-paused after finding out OOC that all three of your Dukes were ready to kick you out, kthxbai.
What I was saying was that words, oaths, deals, agreements and pacts were broken constantly in the Middle Ages. In the end an oath is only as solid as as the ones enforcing it.