My favorite ex....

So... I have this ex boyfriend. We 'met' professionally about 5 years ago, became friendly about 3 years ago and dated for about 8 months. I worked in a pharmacy and he worked for a pharmacy help desk. Some people that know us say that we have a sick and twisted relationship. Be that as it may, that's what works for us. He and I were friends first, we decided to date, it ended badly because we never should have dated to begin with, and now we're friends again. It was really hard working through our issues to get back to this point. He and I both blog. We both are aware of each other's blogs, he reads mine on occasion and I tend to avoid his just because I respect his privacy. Today I decided to read his blog just because when we were talking last night I said something that pissed him off and he said he was going to blog about it. I read that post and started poking around at his other posts. He mostly posts about a recent relationship and doesn't really say anything that he and I haven't talked about on the phone. I stumbled across a post that I think I wasn't supposed to see. His post went into our break up and some lingering feelings he had for me for quite sometime. I want to say I'm sorry for hurting him, but I don't know if I should open that can of worms. Should I tell him I read the post? Our romantic relationship was over years ago and most of our issues concerning that part of our lives is water under the bridge. I wish I could go back and "unread" that post.