Two months ago, I slept with an old friend. My husband and I have been having marital problems for a long time. The last year or so, the tension has cause my husband to ejaculate too quickly or not be able to keep an erection up. We basically stopped having sex. At a vulnerable moment, I had sex with my friend.
I felt guilty and told my friend that I couldn't see him any longer. I started writing in my journal about what happened and my feelings. Last week, I came home and found my journal in a different place than I originally left it. I suspect my husband read it. However, he isn't saying anything. But he did start sleeping on the couch.

What should I do?