Contractor Saw My Wife Naked

We are having work done on our home, including changing out all of the internal doors with designer doors. When the contractor left yesterday, all of the doors were off, including the bathroom. As soon as he left, my wife got ready for a bath. The contractor came back in, saying he had forgotten one of his tools. When he came in, he saw my wife completely naked in the bathroom, about to step into the tub. He said, "Oh sorry," but then proceeded to ask if she had seen his drill and to chat for a few minutes about the remodel. More embarrassing, she seemed fine with it, sitting on the edge of the tub, legs slightly parted, as if it was nothing for him to be looking right up her pussy.

When I asked her about it after he left, she said once he walked in on her naked there was no reason to cover up and it was "no big deal." She said we'll probably get a better deal if he's turned on by her. When he came back today, they were real flirty with each other. He even playfully patted her on the butt. I'm beginning to feel like a cuck.