Not sure how much of the husband's story I can believe here. He might be as delusional as Ai is when it comes to his wife. That's assuming he's not abusive and manipulative.
Kaede sending the same picture to both Ai and her husband is very strange. I have no idea what she's trying to accomplish here.
That's the part that makes me question her motives the most. If she's genuinely trying to get away from an unhappy/bad/dangerous marriage, then why would she symbolically put her husband and lover on the same level by sending them both the photo? Has she sent him all the same photos as she sent Ai? Is she playing a game to see how they both react, or is this a cry for help that even she doesn't understand?
We're getting tiny glimpses through the keyhole, and everyone involved has only one small part of the story. Ai sees it one way, the husband sees it another, and Kon is just on the outside trying to deal with her feelings.