Marriage in Crisis

After almost 10 years of marriage, TEN YEARS, this happens. What do I do? Do I confront him? Do I ask him if this is a one time thing? Was he just curious? Why did he save it? I am so confused. And a little jealous. This is real, I really did find the following picture saved among hundreds of recent pictures of Little Man. This is just.... I don't know what to say. I know he meets unsavory characters on his job. I know he gets propsitioned. But to have something like this in our own home. Did he meet her out there on the streets? How can I ever trust him again...Is she prettier than me? Smarter? What do you think of her?