Not a Laughing Matter
Saying your vows to one another is a pretty important part of the wedding ceremony. While it’s usually serious, some couples do crack a smile or laugh at something silly the other one says. What is unusual to do, however, is to laugh your head off while saying them as if the whole thing is a joke to you.
That’s what this OP did and it made everyone present extremely uncomfortable. In hindsight, they felt like it was because their brain knew how badly they didn’t want to be there. Apparently, their marriage just lasted a year. It’s unfortunate that they didn’t call it off sooner but oh well…