How would you feel if you read this?

I walked into my husbands office while he was at work yesterday. He left a notebook open and I read what was there. It said “I wish I could love you the way you love me”. I instantly thought it was about me. He also wrote that he’s hanging on to memories which I thought meant that he was holding on to memories of one of his exes. I walked out because I felt bad for reading what he wrote but my heart is absolutely broken. I’m not sure what to think. I asked him about it and he didn’t deny and he didn’t agree. But I looked in his eyes and I could just tell that it was true. I’ve known him for six years, I know when he’s lying. He doesn’t love me in the way I love him. We’ve been together for five years and married for two. I feel like all that time was a lie because it clearly didn’t mean as much to him as it did to me. This hurts.