The way Cedric actually presented the allegations didn't seem like it was a big deal but it was for him. What he didn't understand was that even if Callista had mistakenly gotten a wrong letter she should have been kind enough to send it to the person it was intended to.
And everyone could rest on that ground. It was a mistake, but she didn't, and he had an upset wife who pretended like she didn't care, then went ahead to smash everything she could lay her hands on in her room.
Personally, he didn't care that she went on an anger spree, destroying everything. Everything that was broken could be replaced, what ticked him off was the fact she was still recuperating. She could have hurt herself during then.
"Pardon me, what do you mean by it was addressed to Abrielle? " Callista asked Cedric, looking honestly confused.