So this is a tough one for me. I don't know the exact circumstances in which you came across this information...I guess, technically, no matter what the circumstances were, you shouldn't have read any further once you realized what you had in your hands. But if he wanted something to be private, it shouldn't have been anywhere accessible to others. My mom always told me not to write anything down that you wouldn't want someone else to read. I still had to learn this lesson the hard way, and to this day, I cannot journal or brainstorm solutions to relationship-type issues on paper, because I know what that can cost me. So berate me if you will, but he could have kept his sh!t private if he wanted to. Now you know what you know. If your health is at stake, you can be tested without his ever having to know. Don't beat yourself up too much...what's done is done...you can choose differently the next time...